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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 Alpinestars Vapor Knee Guards are innovative, ergonomically-optimized and made from light, breathable materials while,robust outer protection structures to provide a close fit, superb articulation and greater impact performance.


  • 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.

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Alpinestars Vapor Knee Guards 4.2 5 22 22
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
Work well These knee guards fit well and stay in place. As another reviewer noted, perhaps they'd fit under super baggie pants but otherwise expect to wear them as an outer layer. They are very comfortable over jeans and I don't even feel them. Also I didn't have the strap issues that another reviewer mentioned. June 21, 2015
Great value for the money Good bang for the buck, fits good but slightly slides from the tank September 8, 2014
Great buy for the price! Good buy. Fills it's purpose. I've got skinny legs, and they seem to fit fine. Have yet to crash test them, hopefully will never have to. March 19, 2014
Inexpensive, effective I don't want to outfit my wardrobe with a bunch of ugly, ill-fitting kevlar or armor-ready jeans that cost north of 2 benjamins each. I like my clothes just fine. Depending on your style, these guards are great for keeping you safe from point A to B. A couple of people mentioned they are "low profile" and fit "great under work pants or jeans." NOPE - I disagree. I wore these under my relaxed-fit Levis and they are totally noticeable and uncomfortable. But they are great to just wear on top of the jeans/pants and get rolling, that keeps me comfortable and safe. Otherwise it's a simple, cheap, effective pair. True to size. They are L/R specific (asymmetric), designed to give a bit more coverage to the outer sides. One more thing - I like to wear them rotated outwards a bit (see pics) so they cover even more of the outer calves and knee joints. February 12, 2014
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