1/8″ neoprene support with adjustable felt horseshoe-buttress or sewn-in donut buttress to accommodate mild patella tendonitis, chondromalacia, or subluxation. Donut buttress may be trimmed to allow for medial, lateral, inferior, or superior buttress. Medial/lateral spiral stays and superior/interior compression straps provide additional stability. Open popliteal available with donut buttress only. Measurement taken 6″ above mid-patella.