Super stiff, mono-hinge frame with three-point force distributionVery low-profile inner knee for superior bike feelReduction of forces to limit knee injuries:- ACL, Meniscus and MCLCertified as medical device:- EU CA014741- USA FDA 10048761CE tested and certified as impact protection:- Knee EN1621-1Hyper extension limitations 10?, 15?, 20? and 25? for ACL injury reductionFixed hyper flexion stoppers for meniscus injury reductionEngineered, lab tested built-in fracture pointsThe C-Frame chassis breaks before injuring:The shin bone (Tibia) or the thigh bone (Femur)Comfortable, low-profile shin bone plate with load distribution pad that fits inside all bootsPlease look at the product video, fitting video and biomedical white paperPlease look at our sizing chart for best fit: S/M-XXLKnee Brace Sleeves included