The Hinged Neoprene Knee Support is made of a four-way stretch, 1/8" neoprene that gives uniform compression. It also has a removable U-Buttress that can be positioned in the superior or inferior position and medial and lateral heavy-duty hinges for a high level of stability. The unique soft-seam construction is smooth to reduce irritation caused by conventional methods of seaming. Two circumferential straps with loop lock closures help limit migration and control the patella. For sizing measure around the knee cap. Available in sizes small (13-14 in.), medium (14-16 in.), large (16-18 in.), x-large (18-20 in.), and xx-large (20-22 in.).