DAS Leben Breathable Neoprene Knee Brace and Support with Open Patella Knee Protector Wrap DESIGN-Open patella design relieves pressure and helps reduce knee joint fatigue from intense exercises and heavy usage, reinforced patella stabilizer to hold the patella in proper position and to stabilize ACL, PCL, LCL, and MCL ligament, Wraparound design is easy to wear and remove ONE SIZE FIT ALL-Adjustable straps for customized fit and support, 54.5CM long x 20, one Size fits 12.5"-18" in knee circumference, fits both left and right knees MATERIAL-Sring support, OK fabric, Triple lock, EVA gasket, Non-slip silicone, Breathable Mesh FUNCTION-Guides the knee cap into proper motion; effectively relieves post-surgery knee pain, strains, and arthritis Note: Just ONE PIECE concluded. A little rubber smell the first time you get it, this rubber is special imported material which will make your knee brace more durable