Injected Carbon Composite Frame Asymmetrical Hinges 40% slimmer inner hinge for superior bike feel Metal geared outer hinge for precise movement and durability Sleeve includes Airflex Impact Gel knee cup with hard shell slider for ultimate knee brace comfort 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 Hyper extension limitations 5º, 10º, 15º and 20º for ACL injury reduction Fixed hyper flexion stoppers for meniscus 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 Size: S-XXL Knee Brace Sleeves included.