The Alpinestars Carbon B2 knee brace is a lightweight, ergonomically engineered knee brace with a carbon composite structure. The four-hinge frame ensures the B2 Carbon Knee Brace stays firmly in place, offering freedom of movement and smooth, neutral action. An advanced nitric rubber compound gives additional impact protection and riding comfort. Smothered cassette edges ensure minimal chance of material obstruction when on the bike. Extension stops are included, provide post-operation support, and help prevent hyperextension injuries. The leg extension movement can be blocked from 0 to 20 degrees. It is C.E. certified to EN 1621. An integrated, semi-rigid TPU (Thermoplastic Polyurethane) knee cup is backed by high-performance protective foam and offers exceptional impact protection to the patella and upper shin. The knee cup is removable, allowing the B2 Carbon Knee Brace to be adapted as a post-operation support device. It is mounted on soft pivots for greater freedom of movement. The D-ring adjuster gives a precise, one-time fitment with quick-release buckles for fast fitting and removal. Left leg version.