McDavid Protective Knee Guard The McDavid™ Knee Guard features a 3/16” thick thermal neoprene sleeve that provides therapeutic body heat retention and soft tissue support. Hinges with hyperextension stops on both sides of the knee. Maximum protection from impact. Geared polycentric hinge with aluminum inlays dissipates force for increased knee stability. Greater joint line clearance. Adjustable VELCRO® brand fasteners. Fits right or left knee. Sold individually.