Medically Certified Protection We learned a lot from developing our C-Frame and X-Frame knee braces, and we recognize the need for a cage type knee brace for junior riders. 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. Maybe it's time to get rid of your knee protectors and get yourself a knee brace? A great alternative knee brace with a single sided hinge is the C-Frame Junior. Injected Composite chassis Slim hinges for superior bike feel Reduction of forces to limit knee injuries: ACL, Meniscus and MCL Certified as medical device: EU CA014741 USA FDA 10048761 Injected Composite hinge covers for rigidity and endurance 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 Sizing: Junior Plastic Free Recyclable Packaging 5020004160