Injected Carbon Composite Frame Separate sleeve with an AirFlex impact gel knee cup and hard-shell slider for ultimate knee brace comfort Reduction of forces to limit knee injuries: ACL, Meniscus and MCL Asymmetrical Hinges 40% slimmer inner hinge for superior bike feel Metal geared outer hinge for precise movement and durability Certified as medical device: EU CA014741 USA FDA 10048761 CE tested and certified as impact protection: Knee EN1621-1 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 Recyclable Packaging 5021200100 (S) 5021200101 (M) 5021200102 (L) 5021200103 (XL)