Medically Certified Knee Brace With Impact Protection. Three-point force distribution with super stiff forged C-arm mono-hinge construction. Reduction of forces to limit knee injuries: ACL. Meniscus. MCL. Certified as medical device: EU CA014741. USA FDA 10048761. CE tested and certified as impact protection: Knee EN1621-1. Hyperextension limitations 10, 15, 20 and 25 for ACL injury reduction. Hyperflexion limitation. Fixed hyperflexion stopper for meniscus injury reduction. Engineered lab tested built-in fracture points: The C-Frame chassis brakes before the threshold for injuring: The shin bone (Tibia). The thigh bone (Femur). Very low profile inner knee for superior bike feel. Comfortable, low-profile shin bone plate with load distribution pad that fits inside all boots. Sold as a pair.