Ideal for: Mild to moderate ligament strians Sprains (ACL/PCL) Meniscal injuries Medial/lateral co-ligament instabilities and tears Hyperextensionot chronic knee instability problems. The non-adjustable, polycentric hinges allow the knee to retain a full range of motion, provide medial/lateral stabilization, and protect the joint against hyperextensioon with a built in stop. Lightweight hinges are made with high-grade, composite material for maximum strength and durability. The contoured condyle shells allow for a better fit and increased comfort while protecting the joint against lateral impacts. The tapered sleeve design and adjustable straps help prevent migration of the brace. The open popliteal helps prevent bunching and irritaion behind the knee. Made of sports neoprene that generates and retains the body’s heat for therapeutic warmth. Size: To determine your size use the chart below. Measure around your thigh 4 to 5 inches above the center of your kneecap. Measure around your calf 4 to 5 inches below the center of your kneecap. SIZE FITS THIGH FITS CALF Small 15-18″ 11-13″ Medium 18-21″ 13-16″ Large 21-25″ 16-19″ X-Large 25-29″ 19-22″ XX-Large 29-33″ 22-24″