Alpinestars Rk-10 Plasma Knee Brace The Supertech Rk-10 Plasma Knee Brace combines cutting-edge technology with a sleek, low-profile design for unmatched off-road performance and knee support. It is impressively lightweight and designed for maximum breathability and comfort, without compromising on protection. At its core is the free-floating Nucleon Plasma knee protector, housed within a revolutionary asymmetric forged carbon fiber frame that enhances rigidity while significantly reducing weight, making it the pinnacle of knee brace innovation. Sizing: The RK-series size chart that Alpinestars provides suggests sizes that are too small Riders suggest purchasing the same size RK knee brace as you wear in other knee braces Pat from the video has a 4.16 measured knee width and requires a size LG knee brace Features: 34-layer carbon frame construction (with forged carbon look) Minimalist frame design with more functional coverage than the Rk-7 Frame geometry crafted from 3-D scans of professional athletes Adjustable patella protector exclusive to Rk-10 Small cell foam padding throughout interior Offers more comfort than Rk-1 or Rk-7 Best bike feel / least cumbersome in RK family Dual hinge pivoting system with off-set design gives a more natural knee bend Numbered for proper fitment Adjustable stopper plates to customize the fit / preferred locations 0-30 degrees by 5 increments Soft and flexible upper and lower frame Replaceable polyurethane and Nucleon Plasma triple segmented knee cups Low-profile four-point hinge system Replaceable hinge covers Viscoelastic material engineered from bio-based polymers and formed into a structure that is pliable in all directions CE level 1 certified