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Alpinestars Vapor Knee Guards
  • Alpinestars Vapor Knee Guards - Black
  • Alpinestars Vapor Knee Guards - Black

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Alpinestars Vapor Knee Guards

The CE certified Alpinestars Vapor Knee Guards are designed to follow the natural curve of your knee, providing articulated protection for dynamic comfort while riding. Light weight and ultra breathable, the Vapor Knee Guards are the perfect addition to your off-road riding kit. 


  • CE certified protection systems utilizing robust protective structures and impact absorption padding
  • Thermo-formed polymer material construction offers improved impact performance
  • Highly ergonomic design improves streamlining while providing crucial protection for MX and off-road riding
  • Asymmetrical and lightweight ergonomic panel construction offers extended protection surfaces to reduce rotation
  • Intelligent fastening systems offer greater flexibility, customization and prevent side rotation
  • Dual strap closure system on Knee Protectors are specially designed to offer more comfort and adjustment
  • Top strap mounted above the knee and lower strap positioned for ergonomic fit
  • Advanced 3D poly padding for increased comfort and a close-fitting performance
  • Vented panels and advanced microfibers give comfort to the rider, preventing heat build-up while maintaining tactile contact with skin
  • Creative silicone printed graphic pattern


  • SM/MD: 8-10MM knee width
  • LG/XL: 10-12MM knee width

Alpinestars Knee Brace Sizing

Size Knee (cm)
SM 8-9
MD 9-10
LG 10-11
XL 11-12.5

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How To Measure

K Knee Using a caliper, measure the width of the knee joint across the kneecap. The leg should be completely straight and in a weight-bearing position.
Product Style RevZilla Item # Manufacturer Product # Availability
Black / SM-MD 844091 6502313-1001SM In Stock: Ships within 24 hours
Black / LG-XL 844092 6502313-1001LXL In Stock: Ships within 24 hours


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We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
Alpinestars Vapor Knee Guards 4.3 5 26 26
Great Commuter Guards I bought these guards for commuting. With a waist size of 32", the SM-MD size fit the best and I have used them for over a year. I crash tested it once and they only had minor stratches. The straps can be messy both on and off the bike and they never quite stay in place. They started to stratch the side of my tank spoiling the decals on my fairings when my knees tighted on the tank. It probably makes more sense to put the guards under a pair of jeans on a sportbike. I still recommend them. August 5, 2016
Protection If you need knee protection and don't want to buy expensive pants, try these. No messed up knees if you hit the ground in these. Excellent quality. July 21, 2016
Happy with my purchase! Was planning to order these knee guards since a long time and so happy that i finally got them. They fit me perfectly and provides great protection. Thanks to AlpineStars and Revzilla. The brilliant pricing makes it a perfect deal. May 10, 2016
Def a must! After seeing a fellow rider break his knee cap I figured knee protection was definitely needed and thank god I did. I ended up hitting some gravel around a turn and these knee guards saved my knees. They fit perfectly around my knee and shin, but just short enough I could wear my riding boots with them. They don't slide up against the tank or scratch the bike up which I noticed a lot of other people complained about other knee guards doing. I personally prefer to put them over my riding pants. i would def recommend these. They're affordable and good quality. April 26, 2016
Ce Rated (for whatever its worth) and good price I seriously hurt my knees falling off my Specialized bicycle a few years ago and figured its probably a good idea having knee protection riding a motorcycle (traveling faster than a bicycle and all). Pros The plastic knee protector feels solid and I like the additional shin protection. Also liked the price I paid for them. Cons (remember these are priced pretty low compard to the competition) Doesn't articulate moves around on rides could use more padding with that said, I will be upgrading from these in the future - possibly the icon stryker or dainese. I'd like an articulating knee guard for more mobility. Also would like a little more padding. Quick Tip - I wear these over some long jons then jeans ontop. helps keep them stable. March 20, 2016
Good product for a great price. I just got into riding and am on a budget, so I needed to keep functionality and protection in mind while keeping the overall cost low. The price for these aren't that much different than knee armor for riding jeans and they offer more protection, especially for the shins. I've worn them under my regular jeans and they are a bit noticeable, but mainly in the knee area. They are comfortable and a great addition to my armor set! March 19, 2016
Better than Fox These fit more securely than Fox or the other brand I tried (I can't remember which). These have an above the knee strap that is a bit too tight but can be altered easily with a small piece of Velcro. This strap makes all the difference in assuring a secure fit. September 23, 2015
Adequate protection for the price Knee guards are great, velcro is adjustable which is great since I bought size LG. When your riding they stay in place, so I am sure they will protect in a crash. Although my only concern is that these are not for walking around, they will slip even with jeans. September 21, 2015
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