Medically Certified Mono-Hinge Protection We present to you, premium medically certified knee protection, natural knee movement, and comfort in one knee brace. Super stiff chassis for maximum control and protection but still comfortable – that is the essence of the mono hinge C-Frame Pro Carbon! The C-Frames three-point force distribution greatly reduces forces to the knee, thereby limiting knee injuries (ACL, Meniscus, and MCL) and makes it a vital piece of protective equipment. Lab-tested built-in fracture points make the C-Frame chassis to break before you injure your shin or thigh bone. You will love the super low-profile Carbon shin plate that fits perfectly inside your boots Super stiff, mono-hinge frame with three-point force distribution Very low-profile inner knee for superior bike feel 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 10º, 15º, 20º and 25º for ACL injury reduction Engineered, lab tested built-in fracture points The C-Frame chassis is designed to break 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 boots Sizing: S/M - L/XL - XXL Plastic Free Recyclable Packaging 5017010100 S/M -SMALL 5017010101 L/XL LARGE 5017010102 XXL-XXL