Feature●100% Carbon●Imported●Injected composite chassis. Slim hinges for superior bike feel. Reduction of forces limits ACL, Meniscus and MCL knee injuries. Aluminium hinge covers for rigidity and endurance.●CE tested certified impact protection, and certified as a medical device. Hyper extension limitations: 10, 15, 20 and 25° 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. .Description We learned a lot from developing our C-Frame and X-Frame knee braces, and we recognize the need for a great knee brace that wont break the bank. Not as stiff as the C-Frame or X-Frame, but a good chassis made from glass-filled nylon for comfort and a Carbon Injected knee for that rigidity. The Z-Frame is also CE certified as a medical device and as impact protection, maybe its time to get rid of your knee protectors and get yourself a knee brace?