Not as stiff as the C-Frame, but a good chassis made from glass-filled nylon for comfort and a Carbon Injected knee for that rigidity, which reduces the ACL, Meniscus, and MCL injury risk. The Z-Frame is also CE certified as a medical device and as impact protection. A great alternative knee brace with a single sided hinge is the C-Frame Junior. • Injected Composite chassis • Slim hinges for superior bike feel • Injected Composite hinge covers for rigidity and endurance • Reduction of forces to limit knee injuries: • ACL, Meniscus and MCL • Certified as medical device: • EU CA014741 • USA FDA 10048761 • Hyper extension limitations 5º, 10º, 15º and 20º for ACL injury reduction • Low-profile shin bone pad for excellent boot fit • Comfortable, easy-fitting and low-profile strap system • Customized fit with interchangeable hinge padding sizes • Size: Junior