La Sportiva Vertical K Review

In a radical departure from its recent models, La Sportiva has designed the Vertical K ($115), a radically light, extremely flexible trail racer that still runs like a shoe (in a good way) that will debut in Spring 2012. When I say radically light, I mean 6.5 ounce (185 gram) light. As for flexibility, I can easily tuck the toe into the heel and tortionally wring it with easy and through a wide range of motion in both the heel and toe. This is the kind of shoe that would make a La Sportiva team member or a fellow trail running editor jealous. How do I know that … because I saw it happen in the couple days since I received my pair.

La Sportiva Vertical K
[Please leave comments asking questions about the Vertical K, as I’ll be adding to this review as I log additional runs.]

Morphodynamic Midsole/Outsole
Last year, I previewed La Sportiva’s Morphodynamic technology. In short, the technology combines an ultralight, highly absorbent midsole material with an undulating outsole covered with sticky rubber. I enjoyed both Morphodynamic models, the Quantum and the Electron, but couldn’t help thinking that this technology had a sexier application in a trail racer. With the Vertical K, La Sportiva has gouged out lateral grooves that significantly reduce the amount of heavy rubber used in the outsole. (FYI, outsole rubber is the densest portion of a running shoe.)

La Sportiva Vertical K outsole
The lateral grooves, which correspond with the troughs in the wavy outsole, and the accompanying lack of rubber greatly add to the shoe’s flexibility. The only trail shoe in my extensive collection in the same league of flexibility was the New Balance Minimus Trail.

As with all of La Sportiva’s Morphodynamic shoes, the Vertical Ks lack a rockplate. The principle behind the MD midsole is that it’s soft and deep enough to absorb pointy obstacles, such as rocks and roots, that rockplates normally protect against. Be aware, that if you’ve run in either the Quantum or Electron, the Vertical K provides less push-through protection than these other models due to its thinner midsole and rubber-free areas in its outsole.

In another departure from the Quantum and Electron, the Vertical K features small lugs, akin to those on the Skylite and Skylite 2.0, that are overlaid on the wavy outsole. While I’ve not had a chance to test the shoes on mud and snow, these lugs shoe greatly improve the shoe’s performance in such conditions.

It’s worth noting that the outsole is made with FriXion XF rubber, the stickiest rubber this climbing shoe manufacturer uses its trail shoes. Having loved the tack of the less sticky Quantum and Electron, I can’t wait to go run more rocks in the Spiderman-power granting Vertical Ks. I know which shoes I’d take on a fall road trip to southern Utah’s redrock country!

For those who care about such things, the Vertical K has a 4mm heel-to-drop with an 18mm heel and 14mm toe height.

Upper
The Vertical K has a one piece structural upper that fits snugly, but with remarkable comfort. Playing with the upper in your hand you’d think it wouldn’t provide enough support, but that’s not the case at all. In a test run, it firmly held my foot in place. Although I’ve yet to go long enough to really put the shoe to the ultimate test, the lack of any primary focus of support in the upper could be a huge advantage in that it wouldn’t put bothersome pressure on any particular point on the foot. The seamlessness of the one piece upper will similarly reduce the chance of foot irritation. I admit to struggling to put the quality and fit of the upper into words. I’ll sum it up generally as saying that the upper is something you’ll want to slip your feet into and test for yourself.

La Sportiva Vertical K upper
According to La Sportiva, the one piece upper that “eliminates the need for a tongue.” However, the lacing area actually includes a tongue-like wrap that comes from the outside of the shoe and, on its unattached side, slips under the laces and into the instep portion of the upper.

There is a heel counter… if you count something that extends no more than an inch above the midsole a heel counter. That counter is asymmetric, wrapping two inches around the outside and three inches to the inside of the shoe.

There are three layers of toe protection ranging from a very lightweight overlay at the widest to a small rubber toe cap extending from the outsole. I’d describe it as minimal, but adequate.

The Vertical K features a scree gaiter covering the laces similar to La Sportiva’s Crosslite and Skylite models. This lycra piece wraps around the entire upper and is considered a gaiter protecting the entire shoe, but its primary use is certainly over the lace area.

Speaking of the lace area, this is one aspect I’ve had trouble with other La Sportiva models with lace covers. With those other models, I struggle to tighten the lowest laces by pulling the upper laces. In fact, I’ve cut the lace guards off some of my shoes. However, I have no such difficulties with the particular combination of thin laces and eyelet system of the Vertical K. Well done, Sportiva!

Call for Comments?
What do you think of La Sportiva’s Vertical K? Please feel free to leave a comment with any question you may have about the shoe.

There are 85 comments

  1. derrick

    Very sweet looking shoe. Will have to continue to drool for a while.

    Great that you got an early chance to test and review. Will be a very heavily anticipated shoe. Enjoy!

  2. Brad MItchell

    Was informed this weekend that Sportiva was going to launch a new lightweight – can't wait to get my hands on a pair.

  3. Run Junkie

    Great review. Looking forward to trying them out. I'm glad they put some "lugs" on the MD sole. One of my only gripes about the Electron is their performance on mud and snow. Cheers.

    1. Bryon Powell

      Great observation, RJ. The added lugs should definitely help in mud and snow. Certainly not a heavily lugged shoe, but that's what the Crosslite is for. The lugs will make it nice one days that include mud and snow… or so I'd guess.

        1. Bruce G

          Mike – by comparison, despite its appearance the sole on the Quantums is surprisingly efficient in mud, the traction is quite solid from the deep grooves in that shoe's outsole.

          It looks like the Vertical K's will be as good, if not better than the Quantums due to the addition of the outsole traction nubs, and maybe the deeper pockets into the midsole layer (though these could fill and pack with mud….have to see how it works in actual use)

          Another option for mud would be the X Country model: a shade under 9 oz on my scale, 4mm heel drop, same outsole and upper as the Crosslites.

  4. Shane

    Thanks for the review, Bryon. I have run two mtn 50's in brand spanking new La Sportiva Skylites. I absolutely love the glove fit of the Skylite (first and 2.0 versions). I agree with you about the difficulties of the hidden lacing system, but it has not bothered me during races. My question is – Did you weigh it yourself or are you reporting the weight as they listed it? Thanks!

    1. Bryon Powell

      Shane, That's my scale weight… and since I received the shoes while on vacation and couldn't resist the temptation to run in them, it includes a bit of dirt on the outsole. :-)

      I definitely needed to removed the scree guard on the Crosslite 2.0s to reduce toe bang on steep descents, which I'm hitting often for UTMB training. While I've only worn them once, the Skylite 2.0s seemed to lockdown a bit better, so I'm not sure I'll need to do the same thing.

  5. Christian

    Any influence on the almost Times Square, flashing neon, billboard type advertisement for La Sportiva all over the shoe? Too much and performance aside it is unattractive and as I'd like to not be bothered by it, aesthetics do count for something with me.

    The Crosslite is the best shoe ever and I can handle the huge La Sportiva on them but this is overkill.

    I would not by this shoe a drink and definitely would not take it home with me no matter how dark I could get my bedroom :)

  6. Larry

    About time LS came out with something like this. I'm still not sold on the MD sole. Although, the Quantums do grip dirt and loose rocks exeptionally well. Saw a guy across the cube aisle at work today wearing a pair of Inov8 Talons. The VertK reminds me of that. I still prefer the original Crosslites as the 2.0's seem to have too much fabric covering the entire shoe and impede breathability. Regardless, I'll have to get a pair of the VertK's when they come out.

    1. Bryon Powell

      Larry, I wore the Crosslite 2.0s at the Speedgoat 50k and had significant issues with wet feet. I'd love to open communications with LS Italy and make the suggestion that a mud shoe needs to be breathable, especially a configuration like the Crosslite 2.0 that's intended for longer runs.

  7. [email protected]

    Thanks for the first review Bryon. I had a chance to see these a couple weeks ago and was very impressed with the initial look. Very light and flexible. Can't wait to get a pair so I can try them out myself.

  8. roger

    Definitely looks like an interesting one to play with over shorter stuff. I've got a wide mid & forefoot and as such haven't tried any La Sportiva yet. We have to order them from overseas to get them in Australia and as much as their shoes look worth a hit out, all of the LS that mates have ordered seem narrow and without wider options. Take 'fits like a glove' and try 'fits like an implant'. Is that going to be an issue with this one and do you know if they're giving any flipperfoot love in the near future?

    Thanks Bryon – really good pics, much more helpful than the ones with the press release.

    1. Bryon Powell

      Roger,

      Glad you liked the iRunFar product pics. When I get the chance, I much prefer taking my own product photos in outdoor locales.

      As for wide models out of La Sportiva, I've not heard anything to that effect.

  9. Chris Lalmond

    Clear and informative review as always! This is why I tell my friends about irunfar… Anyway, what about heel-to-toe drop in the Vertical K's? And is the last the same as the electron and quantum or more similar to the wildcat and raptor?

    Thanks!

    1. Bryon Powell

      Chris, thanks for the kind words. While this review may have been clear and informative, I can't believe I forgot the heel-to-drop when it was right in front of me the whole time. It's 4mm.

      As for the last, it's a different last. The Vertical K is slip lasted with the Dynamic Race last while the Electron and Quantum are slip lasted on the (non-Race) Dynamic last. Not sure on the specific differences between the two lasts, although I suspect the Vertical K is narrower based on standard differences in races lasts. However, the Vertical K does not fit narrower than, say, the Electron or Quantum as there's much more play in the upper.

  10. Frazer

    Good review! Questions:

    I am also curious about the heel to toe drop?

    You said, "The only trail shoe in my extensive collection in the same league of flexibility was the New Balance Minimus Trail." Have you run in the Merrell Trail Glove? If so, how does that compare relative to flexability?

    Does the toe box allow your toes to spread out or is it snug?

    Have you done stream crossings and if so, do they dry well/quickly?

    Thank you!

    1. Bryon Powell

      Frazer,

      The heel-toe drop is 4mm.

      I totally forgot about the Merrell Trail Glove. That's be in the same mix.

      There's more toe room than, say, the Crosslite, but nothing like the Minimus Trail… and that's even without socks in the Vertical K.

      I've not gotten the Vertical K wet, but I anticipate that it will drain very well and dry reasonably well and certainly not poorly.

  11. Erika

    I'm also wondering about the heel/toe drop.

    How narrow/wide are the heel and toe box areas?

    And when will they be available?

    Thanks!

    1. Bryon Powell

      The heel-toe drop is 4 mm.

      I'd say the heel is pleasantly snug with moderate (for non-"barefoot shoes") toe box room trending toward snug. Even if the lasting of the toe box is small, it's forgiving enough to let your toes move a bit. It's not as tight in the toes as the Crosslite.

      The Vertical K will be available in Spring 2012. Not sure on the exact date.

  12. [email protected]

    The catalog gives the heel to toe drop as being 4mm (heel is 18mm and toe is 14mm) with a 7.75oz weight for a sample size (which in most cases is a US size 9, probably a 42.0 for UK). Again, haven't tried it on but it was very flexible with a narrow toe box (like most of the other La Sportiva shoes like the Skylite, Crosslite, X Country, etc.).

    1. Bryon Powell

      La Sportiva's internal weights are all over the place. The workbook lists the Vertical K at 7.75, the tech sheets incongruently list the VK as 8.7 ounces (comes to 247 g!) and 195 g on the main listing, and on the second VK page in the tech sheets lists the VK at 200g (7.05 ounces).

      Having weighed a Euro 42 (close to US men's 9), I got 6.5 ounces.

  13. [email protected]

    Since I still have the catalog in front of me…

    Both the Quantum and Electron are listed as 31/20 for a 11mm drop. The Vertical K is only 4mm. For comparison, the Crosslite (it will be called the C-Lite in 2012 with no changes made other than the name) is 10mm, the new X Country is 5mm, the soon to be release Skylite 2.0 is 6mm.

    The Vertical K will really be a nice lightweight and low profile shoe.

    1. Bryon Powell

      Erik,
      Thanks for filling in for me. Was swamped yesterday and am away from home today.

      BTW, the Skylite 2.0 is a sweet shoe for those looking for a bit more shoe. I'll probably run the Jupiter Peak Steeplechase in them this week. Too soon for me to try to race 2+ hours in the Vertical K.

  14. Jude

    Looking forward to reports for test runs on really muddy and snowy conditions. It doesn't seem like it would shed either easily, but I hope to be wrong. How often do things get stuck in the yellow grooves?

    1. Bryon Powell

      Given how flexibly the shoe is (incredibly so), I can't imagine it holding mud very well (think of an old fashioned ice cube tray flexing and releasing ice), but that's just speculation. I've yet to get anything stuck in the yellow groves, but I only worn them through limited use.

  15. David

    Bryon,

    Would you think this show would work for a 50M or 100M? I love the Electron for long distances and hope the MD on this shoe also will support long distances while coming in lighter than the Electron.

    -David

    1. Bryon Powell

      David,
      That all depends on what other shoes you run in. With no insult meant to the shoe, I couldn't even think of running 50 or 100 miles in it at this point. I considered it for a 2 hour, 15 mile race this weekend and decided that it was too flexible a shoe for me to where for 3,000' of climbing. However, there's enough protection that folks with strong feet and calves could probably get away with a 50 or 100 mile race.

  16. Steve Pero

    Awesome review, Bryon, can't wait to get a pair of these. As you know (from running with me for a bit) I wore the Crosslites (1.0) at Speedgoat, loved them and had no sore feet. Since then I have been training in the Quantums and see the Electrons for the Bear and I'm loving the MD outsole. It's like wearing a shoe like the Crosslite, but without feeling the rocks, these Verticals look perfect and I hope to be running the first half of Hardrock in them next year.

  17. David

    Thanks Bryon! Have loved the Electrons for long 30+ miles runs. I am running the upcoming Cascade Crest 100 in Wildcats for breathability and water drainage and some weight savings. I've run 50M in X-Talon 212s so maybe the Verticke K would be ok, is it as flexible as the Talons? Great review and the first on this shoe that I have found. Thank you for your efforts!

  18. Rob Youngren

    Wow! Looks like Hoka may have some competition now. Light weight, low heel-to-toe drop (both Hoka and Vertical K have 4mm drop) and deforming outsole. While Hoka's deforming outsole may be a bit overkill, it still is a good approach (IMHO) for those running very long races. The extra cushioning help reduce shock on your feet/legs and the deforming foam sort of take all the bumps out of the trail. Now it looks like La Sportiva has a shoe that might possibly serve the same role but in a much more attractive package. I'm itching to try a pair! BTW, love the Inov-8s for most of my training and 50k or less racing, but ever since the death of the Montrail Vitesse (anybody hear remember that shoe? Ok, do you remember it when it was the One Sport Vitesse? Didn't think so!) I've been searching for my "100 miler shoe". Thought it was going to be the Hoka Bondi B, they worked awesome for me at Badwater, but not sure how they'd handle a tough mountain 100?

  19. Jacob

    Bryon,

    Another question regarding the heel…

    I tested a pair of Electrons. I thought the fore/midfoot and the upper were superb. But I thought the heel was about the thickest, clunkiest, most awkward thing I've ever run in. It forced me into a heel strike, got in the way on the downs, and generally made the whole back of the shoe feel unstable.

    How does the heel on the Vert K compare to the Electron, in terms of thickness and agility?

  20. Eddy

    I put about 40 miles or so on a pair of skylite 2.0, great fit, light, flexible but I have a problem with the durability, the fabric near the plastic/rubber toe bumper, on the inside of the shoes is already showing signs of distress, and is developing tears, and this is after only 40 miles. I was going to try the crosslite 2.0 but I think I'll have the same problem, both models having the same upper. Anyone else had this problem?

    1. Steve Pero

      Yes, my Crosslite 2.0's tore right at the bend near the metatarsals with less than 100 miles on them. I still like the original Crosslites the best.

  21. TriTo

    Hi – has anyone of you tested the VK for a >50KM distance?

    Offers the VK enough comfort & protection?

    What about the durability of the Frixion XF rubber?

    THNKS

    TriTo

    1. Bryon Powell

      As of a week and a half ago, these were on the boat over from Italy. While I'm no distribution expert, I suspect that means we'll be seeing this in distribution channels within a few weeks.

      BTW, there was one change to the shoe, they beefed up the upper in the heel.

  22. CraigR

    Never really understood why established companies have to plaster their name all over the shoe? Looks like a great shoe, but I know I'm buying La Sportiva.

  23. Ultrawolf

    Hi Folks,

    This seems to be a great shoe, unfortunately it´s not available in Europe yet. Before ordering it in the states spending a fortune for the postage, did anyone (Bryon probablly ?) both wear the Vertical K and the NB MT110 ? How do they compare ? The Vertical looks like he got much more cushion ? How is the fitting, as good as in the NB ? Looks like it is much hotter, could it be worn sockless ? Could it be worn in a 100 miler like UTMB ? Would definitely wear the NB and love this shoe, still wouldn´t want to miss a chance to test a shoe which might be as good (or even better ?)…

    Thanks & regards from Austria

    Wolfgang

  24. Erik Bahnsen

    I'm also interested in what people feel about how hot the shoe is,sizing and how it might do long distance running. I just returned a pair of Pure Grits ( see my recent post under Pure Grits.

    Cheers

    Erik

  25. Eric Payne

    Hi Erik,

    Like you, I also train primarily in Lyons. I always hesitate to give a review on a product if I've only used it a couple of times, but given the fact that there are virtually ZERO reviews online for this shoe, I'll toss that practice into the wind.

    I've put about 35 miles onto a new pair of Vertical Ks, in nearly every type of dry trail imaginable. I've been up the steep and loose "half-track" of Deadman Gulch, where crappy traction puts you into some prickly pear. Today I ran 7 hrs across all sorts of surfaces: hard pack trail in Hall Ranch, crosscountry over fallen trees to Coffintop Mtn, boulder garden hopping, cross country scrambling through thick brush at Heil Ranch, and then a steep and wobbly talus descent into the quarry. The shoe excelled in every single of these conditions. The squishy outsole is nothing short of perfection in these conditions. I was afraid that too much cushion would feel goofy, and that this would cause me to feel less of the trail. This was not the case and I felt that this shoe was very responsive, yet protective.

    And damn is this shoe light! The upper is the part that i worry about, and I was completely shocked that I didn't shred the upper while snagging it on deadfall on a burn on the side of Coffintop. Later when bushwacking through thick and leafless brush, these shoes never got a hole in them. I'm still sure that something will rub a hole into this absurdly thin mesh, but until then I adore the light weight, the breatability, and perhaps most, the socklike feel of the shoe.

    And this brings me to sizing: my previous shoes were La Sportiva xCountry, which were great though they were hot and a bit too wide for my taste. So, contrary to typical advice for this shoe, I failed to go up half a size. This left me with a fit a bit too tight for my taste, and I probably would have returned them if they weren't purchased through a pro deal. And so I took them out the past two days, swapping out the stock insoles for worn out Inov8 ones, and going sockless to fit into the shoes. This is now certainly my go-to shoe for sockless endeavors. So while I thought that my feet were so narrow that I could handle the tiny toebox, I now know that if I want socks then I'll size up a tad. That said, even after 7 hrs of running, my feet swelling never got so bad that the shoes were uncomfortable. I attribute this to the incredible upper, and lack much of a toebox to restrict the toes.

    I certainly worry about the durability of these, but until they fail, I'm calling them the perfect shoe….

  26. Ultrawolf

    Many thanks for this long review Eric !

    Being out for 7 hours in this shoe, would you also wear it for a 100 miler ? Did you ever log some miles with the NB MT110, how would you compare those two shoes ?

    Many thanks & best wishes from Austria

    Wolfgang

  27. Asa Foley

    Thanks for this review – without it I might not have been willing to spend the extra to buy these.

    I also got a pair of La Sportiva Electrons – My first non Nike running shoes in ten years and I do LOVE these – I hike trails in Cal and these are amazing for grip, weight and overall build quality – hope they hold up to a year of abuse. I had to explain about spin weight – why such lite shoes were a good investment. Now if I can also lose a few pounds… ha.

  28. Eric Payne

    Ultrawolf: I'm not sure if I'd wear these for a 100 miler or not, but I would definitely have them in the quiver and start with them. I got them, hoping they would work out for Hardrock. They should be fine there, but halfway through the race, I could see myself switching to a shoe with a rockplate. Although these shoes have a ton of cushion (not too much, I swear!), I did notice myself starting to get annoyed with rocks poking me through the bottom on that 7 hr run. The fit and weight of the shoe make this annoyance worth it for the time being. I took these shoes out for another 90 minute run last night, and again I was blown away with the fit and soft feel of the upper. I never will get over how fragile these shoes seem sometimes, but i do know that I'm taking them out for a 30 miler with 10k of vertical this Saturday.

  29. Erik Bahnsen

    Eric,

    Thanks for the great review and info about Vert K. I ended having to buy a different shoe before my 30 days were up at BRC .See Review my review on the Broooks Tru Grit thread. BRC did not have Vert K in stock, I ended up with NB MT 110, I have fallen in love with this shoe. I hope to se you on the trails in Lyons.

    Cheers

    Erik

    PS: did you notice Dales Pale Ale was AJ'S pick last week……

  30. Joe D

    I got my Vertical K's this week and took them out for the first time this weekend for two runs, 8 and 18 miles. I absolutely LOVE this shoe. They form to the foot fantastically and handled the Wasatch Bonneville Shoreline trail with ease. I was eager to test them out over a longer run and will say that after the 18 miles, I felt great…feet were solid and so were the legs. I am sold on this shoe. La Sportiva should endorse me based on the number of people I have already raved to about this shoe.

  31. scott collins

    Had the tear problem on the crosslite 2.0. The original 2.0's upper didn't have the TPU covering that the crosslite has, preventing such tears. Thought i saw the new version of the 2.0 now has the TPU. Wondering how the upper on the vertical k will handle?

  32. Erik Bahnsen

    Eric I'm having the same problems with the NB Mt 110 as I did with Mt 101, my heels are getting torn apart. I love all the other aspects of the shoe but Can't deal with torn up heels. I'm wondering how the Vert K's did on your 30 mile run? I think i saw your tracks last weekend on Heil Valley, the La Sportiva are pretty easy to see prints in the sand.

    Erik

  33. Eric Payne ultrapayn

    Erik,

    No way you should have to deal with shredded heals! I'm not sure if you still have time to do a swap at BRC, but I noticed that they have Vertical K's in stock finally. I had zero issues on my 30 mile run with them.

    I have since sized up a half size to accomodate Drymax Hyperthin socks but have been a little less than satisfied. The shoes are still a bit narrow on my right pinky toe, and there is a wee-bit of heel slop as well. I'm pretty sure this is exaggerated since I grew accustomed to the sock-like fit of them being tight, and the grip that your foot gets on the interior from going sockless and sweating. Still, I'm trying to make this work. The narrow feels seems to annoy me during the first 15 minutes of the run, but after that, I stop noticing. NOt sure if that phenomenal upper is stretching out, or perhaps I just get used to it. If you can, definitely try these on before buying!

    I've had no issues with durability of the upper yet, surprisingly. I do suspect that the outsole is starting to thin out since rocks have been bothering me as they poke through more than they used to. Perhaps I was just in an annoyed mood too as i descended the rocky road from Steamboat Mtn.

    PS: shoot me an email and we should run sometime.

  34. Bud

    How do these run on the road? I realize these are trail shoes, but when I travel for work I don't always take more than one pair of running shoes. Was wondering how they do for 5-10 miles worth of sidewalks/roads/bikepaths.

  35. Eric Payne ultrapayn

    Bud: I've not spent a ton of time on pavement with these, but the fact that they don't have big lugs like XCountry's and CLite's makes them much more pleasant on hardpack trails and road. The tread definitely is tacky though, and maybe a little annoying if you get annoyed by those sorts of things. After 200 miles on mine, they still surprisngly have the sticky traction on the outsole..

  36. Eric Payne ultrapayn

    Scott: I have gone up a half size, and even then relied on them stretching and breaking in a tad to relieve some pressure on my pinky toe.

  37. Erik Bahnsen

    Bud,

    I have also put quite a few road/hardpack dirt miles on these shoes and they are doing fine. You realize how sticky they are when you run on the road with them.

    They are really incredible shoes. If you have followed this post you will see I had some problems with other shoes in this category. They are actually in a category of there own. I love them!

    Erik

  38. rms

    A brief Vertical K impression: I've been using the MT110 & Peregrine1 for 50k-50M races, but excited by the 'Hoka-Lite' design of the VK's, wore them for this weekend's Quad Rock 25. I'm a slower, heavier (185lbs) runner, and a couple short jogs beforehand revealed an extreme flexibility in these shoes that stressed my plantars enough to make me insert Superfeet Black insoles for the race. I haven't used insoles since transitioning to minimal shoes early last year.

    I'm glad I did, as I had no plantar issues during the race. The grip to me seemed fine, and the cushion, ah the cushion! Directly comparing them to the MT110, size 13US MT110 vs size 47.5EU, both are 9oz (VK's 10oz w/insole), both shoes are equally nimble, but the VKs absorb much more impact shock, and do not punish you for heelstrikes as the MT110s do. I'm very impressed.

    Be aware! The VK's run very small! My feet measure between 11-12US, I wear a 13US in the MT110, but my longer right foot — which has a hammertoe as well — butts right up against the end of the largest VK size offered, 47.5EU. The flexible slipper-like upper and liberal lube application kept this from being a problem during the race for me, but LASportiva needs to offer larger sizes.

    I would also repeat my caution about going long with the VK before being accustomed to their extreme flexibility, and since large portions of the sole have only a very thin EVA, poke-through is a real concern, another reason for me to wear stiff insoles. But I fully intend to start with them again at an upcoming 50miler.

  39. Ben

    I'm currently recovering from some torn up heals from my MT110s, just tried these (sockless)for the first time tonight, after only a week since the NBs (with some sandy creek crossings) trashed my heels and ankles on a mountain 50k. I've only run 7 miles in these so far, but they were uber sticky on wet roads. My feet were dry despite running through wet, high grass for a few miles. I even busted out a fast 5 min mile chasing some mountain bikers down a trail.

    very impressed with these so far

    I will update after a long mountain run this weekend

  40. David Rees (@studgee

    I have the same tearing on the Crosslite 2.0s, never saw it on the original Crosslites. From what I have seen in the blogs the tear gets worse also. Happily Sportiva has a year warranty for defects and Zappos even offered to let me swap for a different shoe completely.

    I'm trying out the Vertical Ks right now. Just did six miles and they felt amazingly good for such a lite shoe.

    The way the nose is designed and stitched I suspect they will not have the tearing problem the Crosslie 2.0s had also.

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