Mueller model #4547 is a neoprene ankle stabilizer that provides support to injured or weak ankles. The Patented strapping system with criss-cross tension straps provides firm and even support. The sectional design minimizes slippage and bunching and allows a custom fit to the arch area as well as the ankle. Seamless design helps prevent irritation or chafing and the open heel allows for a snug, comfortable fit. Lightweight and fits in most shoe styles. Fits either foot. Black, neoprene. One Size Fits Most.