Suggested HCPCS: L1800, A4466 Spiral Knee Brace. Knitted from one-way stretch elastic. Three pairs of flexible spiral stays. Sized according to knee circumference. Length: 12" Sizes: XS (10½"-12") S (12"-13½") M (13½"-15") L (15"-16½") XL (16½"-18") 2XL (18"-19½") 3XL (19½"-21")