Medically certified protection. Injected composite chassis. Slim hinges for superior bike feel. Aluminum hinge covers for rigidity and endurance. Reduction of forces to limit knee injuries: ACL, Meniscus and MCL. Certified as medical device: EU CA014741. U.S.A. FDA 10048761. CE tested and certified as impact protection: Knee EN1621-1. Hyper extension limitations 5°, 10°, 15° and 20° for ACL injury reduction. Low-profile shin bone pad for excellent boot fit. Comfortable, easy-fitting and low-profile strap system. Customized fit with interchangeable hinge padding sizes. Sold as a pair.