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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
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Alpinestars Vapor Knee Guards 4.2 5 17 17
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
Good bang for buck, Slightly large Bought this to wear over jeans for short grocery runs in the city. Can't really find anything else that can beat the values of these CE approved knee guard for the price. The knee guards are really comfortable and tucks right into my riding boots. The knee guards are a little big for me so I have to pull the straps all the way to get a good fit. My only complain is that the top strap only have a small contact patch for the Velcro. August 15, 2013
good protection but poor fit I got these to go under my REV'IT! Airwave Pants. In theory this was a great decision because the knee armor on overpants moves around too much. And as protection for the knee/shin I think these will do a great job. My problem with them comes in the straps. I tried wearing them with shorts, but the velcro against the leg was too scratchy. And after only about 5 times of using these, the hook on the shin strap moves around causing the strap to loosen and for the pad to slide down my leg. If I get off the bike and walk 20ft (into the store and back) the knee pad will practically be around my ankle. July 30, 2013
Bargain price, but short on features and fit So what you get for this price is a CE-rated pad, and that's a very good deal. I'm wearing these under my Klim Mojave & Dakars, and occasionally jeans. I got the LG-XL - I'm 5"9" 150 lbs - that's correct for me. What you don't get is: 3 straps - the bottom of the pad close to your ankle pushes out when the knee is bent unless you have them tucked into motocross boots. I'm wearing an 8" work boot, so that's a no-go for me. Maybe if the lower pad was a bit longer. w/another strap. Maybe if you were wearing skinny jeans that would not be as noticeable - have not tried that yet. Although the knee pad strap is above the knee, is still rides down behind your knee and can be a small irritant. Still, a very good bargain and better than no knee armor, or built-in pads that sit below the knee. July 10, 2013
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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, 31 Answers
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RevZilla Store asked: Why did you choose this?
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
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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
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Joleen L: These are sold as a pair. They have tags on the inside indicating left and right. Aug 14, 2013
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Joseph H: The vapor knee guards are sold as a pair. They are labeled left and right. Aug 14, 2013
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David S: No, just order one, they do come in a pair. I own these. Aug 14, 2013
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Danny O: This item does come in a pair.
Aug 14, 2013
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Thomas L: Sold in pairs. One left, one right Aug 14, 2013
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Marco F: Yes they come in a pair Aug 14, 2013
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Charles G: It is sold as a pair. Aug 14, 2013
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ben h: They come as a pair. Aug 14, 2013
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Gabriel B: It comes as a pair. Aug 18, 2013
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Maciej D: Comes in a pair Aug 14, 2013
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James F: Pair, buy 1. Aug 15, 2013
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A shopper asked: Can I expect these to fit under jeans? Feb 15, 2013
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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
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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
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HubbaBubba: Yes, unless you wear skinny jeans May 23, 2013
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Denis I asked: Hi, if i will wearing it with pants 'alpine stars A10 sport' it be comfortable or not? Jun 1, 2014
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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
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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
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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