1/8" neoprene with tubular sewn-in "J" buttress and dynamic side-pull compression strap supports patella malalignment, dislocation, and subluxation. Sold in right and left configuration. Ideal for supporting lateral patella subluxation, dislocation or lateral Patellofemoral malalignment.- Patella Stabilizer, Medium Left, 18"-20" Mfr. Direct