Leatt 5020004160 Knee Brace Z-Frame Junior Medically Certified Knee Protection.We learned a lot from developing our C-Frame and X-Frame knee braces,.and we heard your request for a good knee brace that wont break the bank. Thanks for pushing us!.Not as stiff as the C-Frame or X-Frame, but a darn good chassis in 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 its time to get rid of your knee protectors and get yourself a knee brace?.Next step up is the X-Frame for a stiffer chassis and our top-of-the-line cage hinge construction. 0.00 279.99