The X8 is the most protective, comfortable knee brace on the market utilizing innovative patent pending technology, which incorporates the CCRS (Continuous Cable Routing System) to form an unparalleled system of support and protection. Injection Molded Shells - 20% Glass Filled Nylon shells are designed to be flexible in places to allow the shells to conform to the users leg for better fit, comfort and stability, and designed to be rigid where necessary to resist excessive movement and provide impact resistance. Forged Aluminum Parts - The Dial, Dial Fastener, Extension Stop, and Hinges are made of CNC forged 6061 T-6 aluminum for maximum strength.