SKU: 26618972216

Alpinestars - RK-1 Plasma Knee Brace

Sale price$134.97 Regular price$149.97
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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

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Description

Alpinestars - RK-1 Plasma Knee BraceAlpinestars RK 1 Plasma Knee Brace Anatomically profiled for all forms of off road riding, the RK 1 PLASMA Knee Brace has been engineered to provide comfortable knee support while still being lightweight, breathable, and protective. This knee brace features a Nucleon PLASMA knee protector encased in an innovative hybrid frame construction, consisting of a flexible composite over injected on a high performance polymer blend to offer superb frame

Alpinestars - RK-1 Plasma Knee Brace

Anatomically profiled for all forms of off-road riding, the RK-1 PLASMA Knee Brace has been engineered to provide comfortable knee support while still being lightweight, breathable, and protective. This knee brace features a Nucleon PLASMA knee protector encased in an innovative hybrid frame construction, consisting of a flexible composite over-injected on a high-performance polymer blend to offer superb frame rigidity while still being flexible at the upper and lower strap areas.

  • This brace provides optimal structural integrity and support while being ultra-lightweight and adaptive, and thus reduces the risk of sustaining injuries to the medial and lateral collateral ligament, the anterior and posterior cruciate ligament, and the lateral and medial meniscus.

  • The replaceable triple segmented knee cups are constructed with a polyurethane outer shell backed with a Nucleon PLASMA protector for the optimum blend of impact protection, flexibility, and scratch resistance.

  • The self-centering knee cup and the strategically positioned upper and lower patella extensions ensure maximum coverage regardless of the flexion or extension angles.

  • The extremely stable, slim-design four-point hinge system perfectly follows the articulation of the knee while the extension stops, which are available in a range from 0 to 30 degrees, assist in setting the brace to the desired maximum opening angle.

  • The stainless-steel bushings in the four-point hinge system have an anti-oxidation treatment.

  • Nucleon PLASMA is a viscoelastic material engineered from bio-based polymers and formed into a structure that is pliable in all directions while maintaining the ability to dissipate impact energies. Lightweight and highly ventilated, the knee protector offers strong impact force dispersion and absorption while ensuring maximum coverage in all riding positions.

  • This knee brace features a Nucleon PLASMA knee protector encased in an innovative hybrid frame construction, consisting of a flexible composite over-injected on a high-performance polymer blend to offer superb frame rigidity while still being flexible at the upper and lower strap areas.

  • The replaceable triple segmented knee cups are constructed with a polyurethane outer shell backed with a Nucleon PLASMA protector for the optimum blend of impact protection, flexibility, and scratch resistance.

  • Constructed from USDA certified bio-based eco-friendly and sustainable impact absorbing material.

  • Soft-touch thermoformed padding ensures the highest levels of rider comfort while keeping the knee brace securely in position. Replaceable as a spare part.

  • Soft-touch thermoformed condyle padding comes in different thicknesses for a customized fit. Replaceable as a spare part.

  • Equipped with four individual straps backed with a non-slip material to ensure the knee brace remains securely in position while riding.

  • High tensile strength buckles are robust while still being flexible for easy strapping and adaptivity.

  • Central buckles are easily locked into the closed position by a keyhole snapping system.

  • Inner-knee central buckles are mounted internally inside the frames to avoid contact with the bike.

  • The CE-certified Level 1, RK-1 PLASMA Knee Brace provides optimal structural integrity and support while being ultra-lightweight and adaptive, and thus reduces the rider’s risk of sustaining injuries to the medial and lateral collateral ligament, the anterior and posterior cruciate ligament, and the lateral and medial meniscus.

  • Constructed with a polyurethane outer shell, the replaceable triple segmented knee cups are backed with a Nucleon PLASMA protector for the optimum blend of impact protection, flexibility, and scratch resistance.

  • According to European statutory law the CE mark is a conformity requirement for the marketing of this product. The following standards apply:

  • Knee Protector: EN 1621-1:2012 LEVEL 1

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 26618972216

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Joyce mullis
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★★★★★ 5
Soft, white shirt
Fit perfectly
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Reviewed in the United States on June 9, 2025
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Danny
Los Angeles, US
★★★★★ 5
Size matters: They fit to the size you order.
Size: 34, Color: Black
I’ve found these sweatpants are light & fit to my size. Comfortable & reasonably priced, I’ve ordered a second pair.
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Reviewed in the United States on May 8, 2026
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ATB23
Birmingham, US
★★★★★ 4
Somewhat satisfied
Size: 38, Color: Light Khaki
I like them........ but don't love them. comfortable material but fit is a little off for me. Ordered these because of the length which was perfect....... until you sit down. They tend to hike up quite a bit which was the issue with even my no so long joggers. Figured these would solve that high-water-esque issue but they did not. They really ride up the legs when seated.
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Reviewed in the United States on May 27, 2026
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quiet storm
Battle Creek, US
★★★★★ 5
Good buy
Size: 32, Color: Black
Bought these for staff and they fit everyone perfectly. They say they are very comfortable, breathable, waterproof and fit very well.
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Reviewed in the United States on March 28, 2026
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ITriedThisOne
Bozeman, US
★★★★★ 5
Look great on my preteen with just a little chub who wears 32 or 34" with 32" inseam
Size: 32, Color: Navy, Size: 32, Color: Navy
I got these in a 32" waist for my preteen son who is between 32 and 34 right now. He either has pants that are too tight or too loose and he feels like they're falling off all the time. These fit him perfectly. The length hits just right, the stretch in the waist is enough that they fit well without squeezing his pre-growth-spurt chub out in an unflattering way. They are comfortable enough he came out with a smile and asked if he could keep them on. That hasn't happened in a very long time. He loves the pockets. I'm really hoping that when he grows a few more inches they still look as good on him. He did say they conduct the temperature a lot, so if you're wearing them outside on a cool day, you might need to layer a bit. They also do have a bit of a swish too them as they are the water repellant material, but it's a quiet swish rather than the 80s/90s rain wear swish too many of us remember too well. If you have a little chub and want to look sleek, these are a great option. I'm impressed with how flattering they are on his current build. He wears pants with a 32" inseam and these fit him just like it's shown in the ads, snug right around the ankle by the shoe. I haven't included pictures of him wearing them as there are already quite a few of those, but these do attract dog hair more than an average pair of jeans in the crotch and ankles. Why those spots, I have no idea. I just know that our cream colored Siberian husky is shedding a ridiculous amount right now and you can really see it on these pants, so be prepared to get some sort of lint roller/remover for these. As a side note, it also had the appearance of pilling in some of the pictures I took, but I couldn't see or feel anything there, so I'll be watching to see if there is randomly the same dust all over the pants or if pilling starts to happen. Also, he knows chub or no chub he's amazing and handsome and I'm proud he's mine, so it's not me being a harsh mama, just an honest mama in this review.
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Reviewed in the United States on January 18, 2026

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