MEDICALLY CERTIFIED MONO-HINGE PROTECTION All new for 2023, we introduce the C-Frame Hybrid. Having listened to consumer feedback on the C-Frame Pro Carbon regarding some race fit pants, we have been able to reduce a large amount of the bulk in the knee area by using a separate sleeve with a built in Impact tested CE certified protector, this allows freer movement when wearing race pants. The C-Frame Hybrid retains the super stiff chassis for maximum control and protection but still comfortable – that is the essence of the mono hinge on the C-Frame Hybrid! 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. If you are looking for a traditional dual hinged knee brace, take a look at the X-Frame Hybrid. Super stiff, mono-hinge frame with three-point force distribution Hybrid 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 Very low-profile inner knee for superior bike feel 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 5023050500 (S/M) 5023050502 (XXL)