Injected Carbon Composite Frame Hybrid AirFlex impact gel knee cup with hard shell slider for ultimate knee brace comfort Asymmetrical Hinges 40% slimmer inner hinge for superior bike feel Metal geared outer hinge for precise movement and durability The Leatt X-Frame Hybrid Knee Brace is manufactured from Injected Carbon Composite and has a 40% slimmer hinge on the inside to provide superior bike feel, the outer hinge has metal gears for durable and precise movement. We use a separate sleeve with a CE certified impact protector built in to reduce the bulk in the knee area allowing freer movement when wearing race pants. A numbered strapping system for ease and different sized hinge pads are included with a low-profile shin plate all ensure the fit is perfect for you and above all comfortable. The X-Frame Hybrid Knee Brace is made of Injected Carbon Composite and is the top-level cage-type knee brace in our range.