Vibram made their name off their FiveFingers design and excellent outsoles. The military has even appropriated the outsoles for heavy-duty combat boots. However, we feel that the Vibram FiveFingers KSO still has some room for improvement. They are better at minimizing blisters and preventing sand and rocks from getting inside on a hike than they used to be, but overall these still lag below most of the other competitors in our review. That said, seasoned barefoot runners and minimalists who have perfected the forefoot strike will find these a companion around the gym or on a short hike. This is a solid shoe for a cross-trainer who wants something flexible enough to wear on the trail, for short runs, and at the gym.
Vibram FiveFingers KSO Review
Cons: Wonky, sizing is tough, take a long time to break-in
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Our Analysis and Test Results
The closest thing to the original FiveFingers design, with minimal outsole padding and a zero-drop ratio, these are among the highest scorers for barefoot accuracy in our review. The FiveFingers KSO is perfect for the minimalist seeking out a lightweight shoe for short hikes or the workout junkies seeking a true barefoot experience.
You'd be correct in thinking that this shoe does very well on short hikes and as a flat shoe for gym-rats and squatters seeking to break the trends in the gym for flat-bottom shoes. None of the other shoes in our review do as well for wearing around the gym, but we only find truly confident people braving the looks you get for wearing the FiveFingers design. However, if you can get over their unique look, these are excellent for someone looking for a barefoot squat shoe that has a bit more uses than just gym-rat uni-tasking.
Not much is more accurate at giving a barefoot experience than a glove for your foot that provides some padding. The abrasion-resistant stretch polyamide of the KSO stands by its name of minimizing hot spots and blister areas, which is necessary because we find most FiveFingers users do not wear socks. The accuracy that Vibram brings to this shoe outshines the accuracy of other shoes with thinner feeling outsoles.
For a shoe to give the option of running without socks, it better have a superior design to prevent hot spots and blisters. Vibram has been doing this foot-glove for a while, and they show it here. The reinforced heel patch made of a thicker supple material eliminates the abrasive heel hotspots runners have complained about when going sockless in other FiveFingers designs. However, the persistent issue of making a glove-like foot mold still has not been solved with this latest iteration. Users have complained that some models in the past ran too small, but we found this version of the KSO ran large and left far too much room on each toe while fitting perfectly everywhere else.
At 6.8 ounces per shoe in men's US size 11.5, these are surely lightweight. Just like the original FiveFingers offering from Vibram, the KSO is designed to feel like a protective foot wrap, and nothing more.
The "Keep Stuff Out" (KSO) moniker works here, and it almost feels like cheating because no shoe has as glove-like a fit as this. But with an essentially smooth bottom, it slips and slides on cobbles outside the gym, let alone on short hikes. We noticed the other smooth bottom shoes experienced similar slippage. If you are looking for a versatile shoe in and out of the gym, we recommend looking elsewhere. We found that the hikes you ought to do in these shoes should stick to relatively flat terrain with lots of gravel and grass to break up the ground because you will slip and slide on smooth rocks, especially if it's even just a little damp out.
Although its namesake acronym might suggest that this shoe will perform well on trails, we believe that the KSO is best suited to the roads and the gym. Their lightweight mesh-upper is good for running in the heat, but even in a light drizzle, we found these shoes to be almost too slick to run in the rain. Comments on style choices aside, we couldn't quite bring ourselves to run around town in these shoes — unless we were running quickly and not running errands.
Many users have complained about the durability of this shoe, but after dozens of miles of runs and hikes, we noticed no depreciation in their quality or performance. In fact, we stand by the report of many other FiveFingers users, that you should expect to have these shoes around for years and years with only maybe an occasional need to give them a light wash.
These are a fair price for what you get: a shoe that can deliver on runs, hikes, and at the gym. They are one of the cheapest pairs of shoes in our review and offer some of the most flexibility in where the shoe shines — just stay off wet slick rocks.
If you are looking for an ultra-barefoot experience and have the confidence to stand up to a few sideways glances at the gym, you will find, as many others have, that you know a secret they don't. The FiveFingers KSO shoe can perform and will outlast most other things in this category. After such a long time on the market, these shoes are still pretty great — though other companies have come forward in a big way since the first FiveFingers models and are starting to outpace them.
— Thomas King