Following success with c-frame and x-frame, Leatt focused on producing the z-frame brace, a certified medical device on a budget. The frame of this brace is made of nylon with glass fia, while the knee shell has carbon inserts to prevent the risk of injury to the anterior cruciate ligament, meniscus and medial collateral ligament. Z-frame is also CE certified as a medical device and impact protection. It's your chance to make the definitive transition from simple knee brace to a certified medical brace.