Vibram Fivefingers Men's KSO

Priced: $42.99 - $85.00 Rated:   - 5 stars out of 5 by 149 reviews.
Vibram Fivefingers KSO
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Vibram Fivefingers KSO -
Vibram FiveFingers have become the more popular barefoot running shoes, thanks to the benefits they provide. FiveFingers shoes stimulate the muscles in your feet and lower legs to build strength, endurance, and improve your range of motion. They feature durable Vibram rubber soles for protection. Included among Vibram FiveFingers KSO's best uses are running, fitness training, cross-fit, light trekking, bouldering, water sports, and travel.

Sizes: 40, 41, 42, 43, 44, 45, 46, 47, Whole Sizes Only.
Important sizing info, please read BEFORE ordering.
If you look closely at the Vibram FiveFingers size chart, you will notice that the numbers printed across the top of the chart refer to your foot's length in inches, NOT US size. Vibram found that, due to the precise nature of the FiveFingers fit, the most accurate size translation was in inches, not US shoe size (which varies across brands and styles). *Please measure both feet from heel to longest toe with a ruler in inches and refer to the size chart next to the size pull-down menu for the right size*


  • The abrasion resistant stretch polyamide fabrickeeps out debis and dirt and the Hypalon straps give a customizable and comfortable fit
  • Single hook-and-loop closure helps secure the fit


  • Thin, abrasion-resistant stretch polyamide and breathable mesh upper wraps your entire forefoot to "Keep Stuff Out"


  • The Antimicrobial treated microfiber in the footbed offers the abilty to get that true bare foot feeling while increasing hte lifetime of the fivefingers by keep stinky micro-organismas from breaking down your KSO

Traction and Grip:

  • Non-marking 3.5mm Vibram TC1 performance rubber outsole is razor-siped for enhanced flexibility and a sure grip on wet or dry surfaces
  • The Vibram TC-1 performance rubber sole has razor siped traction to keep you stable on many varied surfaces


  • Individual toe pockets separate and strengthen toes, improve balance, agility and range of motion.


  • Machine washable. Air dry
  • Antimicrobial microfiber footbed for odor resistance.
  • Trekking
  • Running
  • FOOTBED - Antimicrobial microfiber with 2mm EVA insole
  • Vibram's most popular men's Five Fingers model
  • Voted "Most Popular" Five Finger shoe for its versatility
  • FiveFingers stimulate the muscles in your feet and lower legs to build strength, endurance, and improve your range of motion.
  • Yoga / Pilates
  • After Sport
  • Water Sports
  • Traveling

The Vibram Five Fingers KSO are their most popular men's Five Fingers shoe because they offer incredible comfort, versatility and durability that make them an awesome option for everything from running and trekking, to water sports and after sports chilling. The Five Fingers KSO feature a stretchy and breathable mesh upper that wraps the entire foot and keeps crap such as rocks and dirt out, and a hook-and-loop closure strap to create a more secure and comfortable fit. The non-marking 3.5mm Vibram TC1 performance rubber outsole is built to offer greater flexibility and a better grip on both wet and dry surfaces.

Getting the right size and style of FiveFingers is supes important to making your venture into barefoot fitness a success. Check out our to watch some videos, learn how to size your feet for FiveFingers, and find which FiveFingers are best for which activities.

FEATURES of the Vibram Five Fingers Men's KSO Shoes.
SPECIFICATIONS of the Vibram Five Fingers Men's KSO Shoes.
Where will your day take you? On trail? Through the bustling city streets? Perhaps over your favorite running path? Wherever it leads you, trek freely in the adventure-bound versatility of the KSO from Vibram FiveFingers®.
Built specifically to promote a barefoot-like experience.
Ideal for running, fitness, water sports, yoga and pilates, on- and off-road adventures, as well as everyday casual wear.
1. Insert foot, slipping each toe into the individual toe pockets. It may work best to begin with the big toe.
2. After each toe is in place, slip heel in and adjust until it is snuggly in place.
3. Secure the strap, making sure it lies flat across top of foot. Wiggle toes and adjust strap until you find the ideal fit.
Thin, abrasion-resistant stretch polyamide and breathable mesh upper materials.
Upper envelopes the foot to help keep debris out.
Individual toe pockets promote muscle strengthening in the feet and lower legs, as well as improve balance, agility and range of motion.
Adjustable, hook-and-loop Hypalon® strap wraps the top of foot through the heel for a secure fit.
Heel pull loop for an easier on and off.
2mm, antimicrobial, microfiber footbed offers light underfoot cushioning.
Non-marking, 3.5mm Vibram® TC-1 Performance rubber provides exceptional underfoot feel without compromising abrasion resistance.
Durable outsole design helps protect feet from hot surfaces and rugged terrain, while thin razor-sipping heightens flexibility and slip resistance over wet and dry surfaces.

The KSO from Fivefingers is a radical redesign on the shoe. Many experts think that the modern shoe is too protective of the foot and does not allow someone to fully develop the muscles and tendons, making the foot more prone to being injured. The KSO was designed with this in mind, allowing you to exercise the foot in its natural state while you do your normal daily activities. Whether you are running errands in Downtown Tucson or leisurely walk down Sabino Canyon. The experts say by doing these activities while wearing a pair of five fingers that you will improve the wearer’s agility, balance and proprioperception, the awareness of your foot’s movements or foot/eye coordination. The KSO has a breathable mesh top that is abrasion resistant to Keep Stuff Out while still preserving that bare foot feeling. The Vibram TC1 performance rubber soles are non-marking and provide a reliable grip while protecting the soles of your feet from non-natural items out in the environment.


The Vibram FiveFingers KSO for Men in Black/Black is an alternative to traditional footwear for running and fitness training. It features a thin, abrasion-resistant stretch polyamide and breathable mesh upper that wraps your entire forefoot to 'Keep Stuff Out.' A single hook-and-loop closure helps secure the fit while the non-marking 3.5mm Vibram TC1 performance rubber outsole is razor-siped for enhanced flexibility and a sure grip on wet or dry surfaces.
In just over a year, the KSO has become our most popular model for men. Featuring a thin, abrasion-resistant stretch nylon and breathable mesh upper that wraps your entire forefoot to `Keep Stuff Out.` A single hook-and-loop closure helps secure the fit. A non-marking 3.5mm Vibram TC1 performance rubber sole is razor-siped for a sure grip, and a 2mm EVA insole enhances plating protection and comfort.

•KSO IS BEST FOR: Running, Light Trekking, Climbing/Bouldering, Running, Fitness, After Sport, Water Sports, Yoga/Pilates & Travel.
•Materials: UPPER - abrasion-resistant stretch polyamide fabric & Hypalon® straps.
•SOLE- Vibram TC-1 performance rubber.
•FOOTBED- Antimicrobial microfiber with 2mm EVA insole.
Air dry.
•Weight: Men’s size 42 - 5.7 oz. each, 11.4 oz.

Massey's Outfitters
Voted “Most Popular” for its versatility. Over the last two years, the KSO has become our most popular model for men for its unbeatable comfort and versatility. It features a thin, abrasion-resistant stretch polyamide and breathable mesh upper that wraps your entire forefoot to “Keep Stuff Out.” A single hook-and-loop closure helps secure the fit. The non-marking 3.5mm Vibram® TC1 performance rubber outsole is razor-siped for enhanced flexibility and a sure grip on wet or dry surfaces.
Mountain Gear
Go barefoot in the park, path and parking lot with Vibram's foot-friendly barefoot FiveFingers KSO shoe. Top 25 Category Product
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Average Price History: Price History
Review RatingNumber of Reviews
Also available for: Women, Girls, Kids
Avg. Wt.:11.4 oz. (pair).
Closure:Hook and Loop
Footbed:Antimicrobial microfiber with 2mm EVA insole
Materials:Upper: abrasion-resistant stretch polyamide fabric & Hypalon® straps
Outsole:Vibram TC-1
Popular uses:fitness, yoga/pilates, water sports, after sport, traveling, trekking, running
Sizing Scale:EU
Sole:Vibram TC-1 performance rubber
Upper:abrasion-resistant stretch polyamide fabric and Hypalon straps
Upper Material:Synthetic
Weight:5.7 oz each, 11.4 oz per pair
Weight (M's size 43):5.7oz each
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Vibram Fivefingers KSO Reviews:

Positive Reviews:

Evangelical shoe

OK, I reviewed the KSO Trek also, and this is essentially the same review with a few minor differences.

I love these shoes so much I have become a pest to my friends talking about them. I am a Five Fingers convert and am almost ready to go door to door preaching about them.

You must measure your foot. See below.

I purchased these directly in the Paramus store. Great place.

These are a lighter sole than the KSO Treks, so I would not use them in rocky areas. I have been wearing KSO Treks hiking around the local NJ county and state parks in the Ramapo Mountain area. Those work fine there, these regular KSO's may be too light weight for that terrain. But you may be OK with them. I did see one person running there with these and he seemed OK with them. If you know the area, that will give you an idea. For carriage trails or converted railroads and daily wear they would be fine.

Socks may be a good idea for multi-hour use. I rarely wear them with these regular KSO's except for going to the office. I do not have the problem with my feet sticking in them as I do with the KSO Trek. Socks allow me to wear them to work and change shoes without keeping a regular pair of socks handy. Toe socks are very comfortable inside regular shoes. I have come to prefer toe socks over regular socks for general wear. I wish Campmor would carry the regular crew Injinji socks alongside the mini and micro crews.

Like the KSO Trek, these did not cause any blisters on my feet, even after an entire day of jumping in and out of my truck and walking around vacant land up in the Catskills. I have never had that happen with any pair shoes other than the KSO Treks. I have narrow feet and everything causes blisters.

I also use these, along with the regular KSO's, as daily wear. I sometimes forget I have them on, they are that comfortable. Not something I can say about most shoes.

They will get a bit stinky after a solid week of wearing them, but they are machine washable and dry fast. I just toss them in the washer for a quick cycle with some regular detergent and hang them to dry.

Like the KSO Treks, I do wish they used a different fastener than Velcro. Perhaps a friction buckle or fastex type thing. velcro sticks to too many things.

You must measure your foot. Do not go by European sizing alone.

The first pair of these I bought at another retailer that did not have a good return policy for used shoes. Even though I tried them on I thought the 42 size was too tight and bought 43. Turns out 42 was correct. These are supposed to fit very closely with almost no space at the end of your longest toe.

I had to buy a second pair for the right size, but I got those from the Campmor store when I found out they were stocking them.

Go to the Vibram site and see what inch size matches to the shoe sizes. For instance, my 10-3/4 inch foot goes into a 42 KSO or KSO Trek, or a 43 Moc, though a 42 Moc would also fit. But in normal shoes I typically wear a 44. So MEASURE YOUR FOOT.

Campmor might post the sizes for these shoes in inches rather than the Euro-sizes to emphasize the need to measure your foot.

The only reason I rate these and the KSO Treks 4 stars is the Velcro strap. It is upside down with the hooks on the shoe rather than the strap. This means when I sit they grab onto what I am sitting on, like a cushion, etc. I prefer other fasteners in general, laces or a friction strap would do better here I think.
tomwright at Campmor on 09/09/2010

Like socks with a sole

If you've wanted to try barefoot running, these are a must. They fit like socks, but add protection to your soles from little sticks, rocks, glass, and "gotchas" that might ruin a good run. SIZING:Recommend actually measuring your foot in inches/cm using the method recommended at [@] - you get the right fit. Make sure you use your bigger foot.SHAPE:They are relatively square up front which accommodates a wider range of "toe slope" (ie: the angle of your foot slope from big toe to little toe). My little toe barely goes into the toe slot but still a good fit. The rest of the shoe is stretchy, so fit is excellent.GRIP:The sole is like a boat shoe; slightly gummy and sticky! You need to bend the shoe to see the cuts in the sole. All the pictures make it look slippery. It's far from that. Great for running.KSO vs Others:This model has a full "sock" and velcro strap, making it a good all-around choice. The sock prevents dirt and junk from going into the shoe. KSO + barefoot makes a better seal than the base model + socks.CHAFF:The seams inside are not sewn flat. This, makes them a little uncomfortable for long runs in warm weather barefoot. Better with very thin toe socks.
Marc at Campmor on 07/07/2011

Maybe not for everybody but I like them

First off, the KSO has a very smooth bottom so don't get this shoe if you are looking for something with traction. The Trek or Trek Sport would provide good traction. Also the KSO is a thin sole (2mm I think) so I would not recommend it for running on very rough terrain, such as a gravel road. I would never recommend ANY fivefingers shoes for use on paved roads as that invalidates the theoretical benefit of barefoot running (adapting to terrain).

With that said, if you want these to wear while walking, jogging, hiking on natural terrain that is not TOO jagged/rough, these are probably idea.

I followed the EXACT sizing technique on the Vibram video and carefully measured myself to 11 1/2" which equaled a 45 in KSO.. they were slightly too small so I had to send back for 46. They are great. I also have since gotten TREK SPORT in 46 (because of the traction issue I mentioned) and they also fit very well. I use them for grass volleyball and I might use them for trail/obstacle running too once my feet get used to them.
Kevin at Campmor on 08/08/2011

Unbelievable Shoes!

I love my shoes and I get compliments on them almost every single day. They are extremely comfortable and have really helped out my balance and hand-eye coordination. The one thing that you CAN'T DO with them though is have what they call "fadeaway" shots in basketball with them. You can't stop and then push off backwards right afterwards to make a shot because it will ruin the shoes in no time. What happens is that your foot will rub against the bottom and begin to leave a mark that goes further in each time that you do that type of a shot or stop extremely quickly. Other than that, the shoes are unbeatable and I am extremely happy that I bought them. I just play basketball and when I have these shoes on...I just don't use fadeaway shots and attempt to not stop too quickly too often. They aren't for sports that require quick movement and fast stopping and starting such as basketball and tennis. Either way, BUY THEM! THEY ARE AMAZING!
Just Give Me The Ball at on 04/04/2010

Poor fit for non-standard toe lengths

My big toe is longer than my second toe, and my remaining toes are relatively short and closely spaced. The smallest two toes slip out of the Five Fingers because the shoes spread too much at the toe (not made for narrower feet/smaller small toes). Not only that, the toe pockets on the shoes are very long compared to my smallest three toes. These are my first pair of Five Fingers, and the shoes are slightly large--will order 2 sizes smaller next time--but believe Vibram should come up with a way to accommodate those of us with smaller small toes that are relatively close together (narrow foot?? I wear D width running shoes...) Be careful how you order, size-wise, and be prepared for an imperfect (but still acceptable) fit.

As far as usefulness, I have done much walking in the shoes to condition my feet to barefoot activities. The shoes appear to have stretched a bit. Have run a little in the shoes so far, with no adverse effects.
Mike the Runner at on 10/10/2009

Awesome shoes!

I loved these shoes! I bought a size 40 which was a size too small and I still didn't want to send them back and be without them for long. Every time I took them off and put normal shoes back on my feet, knees and back hurt and I could tell that my body was begging me to put the VFFs back on. I miss my shoes but the correct size is in the mail and on their way back to me. If I could wear these at work I would! I can't tell you how much of an improvement I've felt in my body since I started training in these. I recommend these shoes for everyone that asks me about them. The only problems I've had with my VFFs so far is they are not too warm in colder weather and I bought a size too small so they were uncomfortable after more then 5 hours of use.
B-rett at on 12/12/2010

Like going bare foot? This is your shoe

If you don't mind having people stare at your feet, this is an amazing shoe. I'm one of those people that hates watching sports on TV. I'd rather go out and play the game myself. These shoes lend themselves to any sport be it sailing (which I do on the high school team) or running. The beauty of these shoes is that you fell whatever surface is beneath you, leaving you with the ability to focus on other thing (this is especially important in sailing). Also, they are super easy to wash and they dry quickly, another nice feature for those of us who love to play in the salt water and mud.
I should mention that this is not a good pair of shoes for tennis or skateboarding. That said, they work remarkably well running on pavement. All and all, once you get past the somewhat exotic look of the shoe, you will quickly fall in love.
Blake Ryan at Campmor on 07/07/2011

Even Better Than The Hype!

These Vibram 5 Fingers KSO's are the bees knees. I couldn't believe that they had a pair to fit my size 14 Wide feet!

I use this product for light hiking/jogging/disc golf, swimming/fishing, and kayaking/river SUPing.

The product is PERFECT for the water. The grip on these babies stays true on the slippery rocks of the Greenbrier River. GREAT for stand up paddling, as one can really feel the board. Kind of like wearing space age moccasins/toe sock thingies.

They take some getting use to. Only wear them for a couple hours at a time at first to get used to them. I wore them for 15 hours straight the second day, and my feet were killing me! Your leg and foot muscles must get used to them. Now I wear them all the time, and never have a problem. It pretty much feels like going barefoot with really thick calluses on your feet!
Friend of the Lower Greenbrier at Campmor on 06/06/2011

My feet say thanks

Ok like the other review my big and second toe feel fine and then i have the once in a blue stumble with the other toe pockets being a bit too big. So lets see I've climbed up section of Mount Lemmon and stuck to the rocks like spiderman, I've ran on the asphalt, concrete for 6 miles..can someone say ouch. I've been hiking in them with family and took off on them, the bottoms having no problems hurting my feet stepping on rocks. I've had them for a month but here is are the facts. My feet hurt. My feet are flat. Five Fingers are breaking down and re-building my feet. They are so much stronger and they are re-building from the feet up. My feet are 100 times stronger then they were a month ago and I'll swear on that. I wear these everyday and have started to see dust settle on my shoes and sneakers.
Yes black people love the mountains too. at on 11/11/2009

Very good shoes

I fell in love with theses shoes as soon as I put them on. They are extremely comfortable, and basically allow you to be barefoot everywhere, but with protetion against sharp objects and with access to shoes-required places.

I coached a volleyball team and spent 9 straight hours in these, most of the time standing or pacing. My feet were only slightly sore, which is much better than with other shoes.

The only minor problem is the strap. For active wearing, it's best to have it rather tight, but it can start to dig into your ankle. With the strap loose, the sides rub a little. I did not have any blisters from either after 9 hours though.

For some people these can take a long time to get used to. I spend a lot my time barefoot already though, especially outside in the summer, so my adjustment time was hours.
A random parkourist and coach. at Campmor on 04/04/2012

Negative Reviews:

I think this is a gimmick

I noted in other reviews that this fit tight, so I ordered the next size up. I'm still not sure that was enough. My right foot, which is the larger, fits well. Oddly, my left, smaller, foot is painful on the end of my fourth toe. Seems too short. And if you wear them too long, the toes all seem to feel like they've been wrapped in Ace bandages all day. They don't break in easily, and leave blisters. I recommend sizing to wear toe socks. Walking several miles in them will result in sore feet. Running in them will result in sore feet and calves.
tommyb at Campmor on 06/06/2011
The size listed was M39. These are much smaller than what I normally wear as a Men's US 9. Once I got my toes in (the pinky toe felt pinched) I couldn't get the shoe past my heels on either foot. Returning for next size up if available. In the past 10 years, I've gone up from a 8.5 to a 9 so, I'm usually in a loose-ish 9 shoe.
Bill - customer at on 07/17/2013

Not for running

wanted to use it mainly for running but after the first 10 minutes a tiny hole started to form on the left big toe!!!!!
firsttimer at Campmor on 06/06/2011

Manufacturing Defect Sole Sepration

Maybe I got a bad pair. I felt they were comfortable and had performance benefits but the sole separated significantly after 2 wearings.
Monty at Campmor on 06/06/2011

Neutral Reviews:

100 % Satisfaction

I have not trained or ran in my shoes yet but I walk in them all the time. When I first got them it hurt my feet to walk on concrete but now they feel fine.There was a short adjustment period, getting use to walking barefoot again especially on concrete. I've walked a mile in them in natural caverns and about a mile and a half in an outdoor mall on back to back days without any problems. If you like being barefoot you will love them you feel the earth beneath your feet. Be prepared to wash them often, my feet sweat a lot and there is no sock to absorb the moisture.
Touché at on 03/03/2010

kso 5 fingers

The only complaint I have is that while my big toe is cramped up with no room at all, my pinky toe barely fits into to hole at all!
mm951 at Campmor on 05/05/2012

Not the shoe for me

My wife loves hers, but I get sore feet after long walks on pavement. I think you'll love them, they're just not for me.
Jack at Campmor on 06/06/2011

Competitive pricing

Ran a bit small, will have to exchange. Otherwise a great product.
Cyclist lover at Campmor on 06/06/2011

Vibram 5 fingers

Cant get toes in correctly. Maybe its just me
Bubba at Campmor on 06/06/2011

Tight but great

Tight fit, great traction. Worth every penny.
Wet footed duck at Campmor on 07/07/2011