The X-Frame Pro Carbon is a medically certified knee brace. It is made of injected carbon composite, and is the top-level dual hinged knee brace in the Leatt range, reducing forces to limit knee injuries. The slimmer inner hinge provides superior bike feel, while the metal geared outer hinge offers precise movement and durability. A numbered strapping system makes it easy to put the X-Frame Pro Carbon on, and the comfortable, low-profile shin bone plate fits perfectly inside your riding boots. Features Injected Carbon Composite Frame Asymmetrical Hinges 40% slimmer inner hinge for superior bike feel Metal geared outer hinge for precise movement and durability Reduction of forces to limit knee injuries: ACL, Meniscus and MCL Certified as medical device: EU CA014741 USA FDA 10048761 CE tested and certified as impact protection: Knee EN1621-1 Level 1 Hyper extension limitations 5º, 10º, 15º and 20º for ACL injury reduction Low-profile shin bone pad that fits inside all boots Comfortable and easy fitting strap system Customized fit with interchangeable hinge padding sizes Sizing: S - M - L - XL - XXL Plastic-free packaging