50%SBR, 20%nylon, 10%spandex, 20%polyester Best Gifts Idea For Your Friends And Family! Professional Knee Brace with Patella Gel Pad & Removable Side Stabilizers, Medical Knee Support with Open Patella and Back Design. Adjustable Velcro Straps for best fit, BEST CHOICE for Pain Relief and Sports Protection - Day & Night Wear. Class 2 Medical Device with FSA/HSA APPROVED Doctor Recommended! ACE-43 NEENCA KNEE SUPPORT TECHNOLOGY An anatomically contoured patella gel pad surrounds your kneecap, removable dual side hinged copper stabilizers fit tightly with your joint. These special functional element strengthen side support and maintains joint stability, providing maximum support for your knee joint, innovatively infuse copper ions into spring stabilizers to help control your movement, effectively assist knee recovery treatment. BEST CHOICE for sports protection and pain recovery. EFFECTIVE RELIEF & SUPPORT The copper hinges on both sides will provide stability