PRODUCT INFORMATION: Diamond embossed neoprene provides a unique look and feel in neoprene Features a spiral spring steel stay to enhance medial/lateral stability 4.5mm neoprene offers adequate support and compression without adding weight and bulk Patellar opening assist with patella tracking, adjustable straps above and below knee prevent unwanted brace migration Small - Measures 12" to 13.5" around the knee at the widest point Medium - Measures 13.5" - 15.5" around the knee at the widest point Large- Measures 15.5" - 17.5" around the knee at the widest point