Log In / Register
0 Checkout
Alpinestars Vapor Knee Guards
  • Alpinestars Vapor Knee Guards - Black
  • Alpinestars Vapor Knee Guards - Black

Please select a Size to check availability, or to add this item to your Shopping Cart or Wish List.


Select Size:

Size Chart

Select qty:

Please select a Size to view availability.
Add to Wish List

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

Alpinestars Knee Brace Sizing

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

Click here to see the full Alpinestars Size Chart
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


Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

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 4.2 5 20 20
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
Look for a better fit First let me say that they seem to be rather well made(not well designed) for the price and I imagine they would provide good protection based on how they feel, but the fit isn't so great. They seem to be a little on the large side but I'll get into the real problem below. The main issue is with the lower strap. The buckle ends up turning in it's strap which loosens the guard. While riding this isn't a huge problem but gets worse once you get off the bike. They should have designed the buckles in order to prevent them from turning. That would have made the product so much better and I would feel confident in recommending them to anyone. The current design is poor and seems as if they cheapened out on the fastening hardware. My solutions has just been to tighten them a bit more than I would like as it helps prevent the loosen becoming too much of issue when the buckle rotates. I would not recommend them to anyone based on the fact that there appears to be so many different knee guard options and to recommend these would be silly. I have not returned them as I don't think the issue is annoying enough to go through the hassle, but I certainly would not repurchase them and advise others to look for a better product. September 13, 2013
Light, reasonably comfortable. These entry-level guards were a good bang for my buck, however I noticed the following things over the last four months of riding: 1) The square plastic loop through which the calf-strap is fed nearly always rotates lengthwise while the knee guard is worn - which narrows and bunches the strap at that contact point. *See pic. 2) The knee-cup liner material is soft to the touch, however after more than an hour riding I feel a friction burn on my knee. I will remedy this by further lining it with fleece. I suspect that at 5'9" & 185 lbs, had I opted for size M/L instead of L/XL I may not be experiencing one issue or the other. August 21, 2013
2 3 next>>
Use our Product Q&A for a chance to win our monthly $100 giveaways.

Have a functionality, fit, or otherwise product-specific question about the Alpinestars Vapor Knee Guards? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Alpinestars Vapor Knee Guards
Already Asked: 4 Questions, 36 Answers
Sort by:
RevZilla Store asked: Why did you choose this?
wesley c: great price Sep 30, 2015
Bobby F: for riding in shorts May 27, 2015
L E: Need good protection for the commute and they fit the bill May 14, 2015
Jofferson G: Will be using these knee guards when I ride to work instead of having to wear a pants over my work pants. I can just take it off and put it in my bag. Apr 7, 2015
James M: I love anything Alpine!! Apr 5, 2015
walter v: I didn't want to wear riding pants, specially to work so i just slip this things on and I'm on my way.. I actually fell on them, prevents knee scraps =D Nov 2, 2014
Jose Luis C: alpinestars is good Nov 2, 2014
M E: not for sport bikes, short ones Oct 14, 2014
Scott J: Hopefully I won't need them but riding in the city gets a little crazy sometimes and you need to protect those knees! Aug 17, 2014
Nathan K: These look like they will be easy to wear and hide under a pair of pants. Aug 6, 2014
William T: While riding street, I'm not wearing my track suit. My legs, (knees) felt venerable so I wanted something that would be able to fit under a pair of jeans. From the reviews, this seems to fit the bill. And for the cost alone, you can't beat it. Astar's for life! Jun 25, 2014
s y: Because they are cheap and look good. Also they have the top strap which many others in its price range did not. Jun 20, 2014
Caleb C: Low price and pretty solid reviews. Jun 19, 2014
Yunfei J: it's just uncomfortable May 23, 2014
Jin P: Great price, solid reviews, 2 velcro strap easy on/off, people say they can wear under jeans or work clothes Feb 10, 2014
Avery S: Good pads for cheap. Nov 6, 2013
A shopper asked: Does this come in a pair? or do you need to buy 2? Aug 13, 2013
Answer this · Send to friends Good question? Yes (0) No (0)
Jeremy Q: Yes, they come as a pair. I'm 6'1", 175lbs. L/XL is good at thigh, but borderline too big at calf. They work, there's just a fair amount of slack in the calf adjustment. Aug 14, 2013
Reply to Jeremy Good answer? Yes (0) No (0)
Ronald G: I wear the L-XL and I was able to fit them underneath my Levi's 514 straight slim jeans. Size 33 x 32. Aug 14, 2013
Reply to Ronald Good answer? Yes (0) No (0)
Joleen L: These are sold as a pair. They have tags on the inside indicating left and right. Aug 14, 2013
Reply to Joleen Good answer? Yes (0) No (0)
Joseph H: The vapor knee guards are sold as a pair. They are labeled left and right. Aug 14, 2013
Reply to Joseph Good answer? Yes (0) No (0)
David S: No, just order one, they do come in a pair. I own these. Aug 14, 2013
Reply to David Good answer? Yes (0) No (0)
Danny O: This item does come in a pair.
Aug 14, 2013
Reply to Danny Good answer? Yes (0) No (0)
Thomas L: Sold in pairs. One left, one right Aug 14, 2013
Reply to Thomas Good answer? Yes (0) No (0)
Marco F: Yes they come in a pair Aug 14, 2013
Reply to Marco Good answer? Yes (0) No (0)
Charles G: It is sold as a pair. Aug 14, 2013
Reply to Charles Good answer? Yes (0) No (0)
ben h: They come as a pair. Aug 14, 2013
Reply to ben Good answer? Yes (0) No (0)
Gabriel B: It comes as a pair. Aug 18, 2013
Reply to Gabriel Good answer? Yes (0) No (0)
Maciej D: Comes in a pair Aug 14, 2013
Reply to Maciej Good answer? Yes (0) No (0)
James F: Pair, buy 1. Aug 15, 2013
Reply to James Good answer? Yes (0) No (0)
A shopper asked: Can I expect these to fit under jeans? Feb 15, 2013
Answer this · Send to friends Good question? Yes (0) No (0)
SMitch: I was able to fit them under a pair of American Eagle boot cut jeans 32/32. It was tight getting the jeans over the knee cup, but it wasn't uncomfortable once I had the jeans over them. It will be a close fit. I like that the jeans hold the guards in place though. Mar 4, 2013
Reply to SMitch Good answer? Yes (0) No (0)
Charles G: Relaxed fit or boot cut and you should be fine. Straight leg/tapered or "skinny" jeans will be a challenge. These are basically moto-x style knee guards. Aug 14, 2013
Reply to Charles Good answer? Yes (0) No (0)
JasonP82: Depends on the cut. I tried them under my Icon Strongarm 2's which are like a regular fit, and they have plenty of room. Mar 9, 2013
Reply to JasonP82 Good answer? Yes (0) No (0)
HubbaBubba: Yes, unless you wear skinny jeans May 23, 2013
Reply to HubbaBubba Good answer? Yes (0) No (0)
Denis I asked: Hi, if i will wearing it with pants 'alpine stars A10 sport' it be comfortable or not? Jun 1, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Kirk W. S: Hi Denis -- I guess it depends on the pant you use. I have had good success using Duluth fire hose pants designed for knee pads so there is extra room in the knee area. K Jun 2, 2014
Reply to Kirk W. Good answer? Yes (0) No (0)
Mitchell B: These fit well infer pants. In fact that's the only way I wear them. Even my slim fitted Dainese Air Drakes look great with them. Very slim and unobtrusive. Jun 1, 2014
Reply to Mitchell Good answer? Yes (0) No (0)