HyperControl Knee Brace. Pull-Up, Large, 20 1/2″ – 23″ (Measure circumference 6″ above mid-patella). Anatomical design features a unique strapping system at the back of the knee to prevent hyperextension. Double hinges made of anodized aluminumn for reduced weight and optimal stability. Superior stability and easy adjustment beacuse all straps attach from the lateral to medial hinge and are half-circular in design. Upper and lower anterior straps are semi-elastic to provide excellent compression. Hook and loop closures in the front of the thigh and the back of the calf allow for easy adjustment. Fitted with dual adjustable buttresses for maximum patella stabilization. Constructed of Tri-Tex material with a four way stretch- a breatable alternative to neoprene. Indications: patellar subluxation, hyperextension, chondromalacia; grade I varus, valgus instability, mild ACL/PCL sprain.