Carbon chassis construction Reduction of forces to limit knee injuries: ACL, Meniscus and MCL Very low-profile inner knee for superior bike feel Introducing 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.The C-Frame chassis was developed with lab-tested, built-in fracture points that are designed 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.