Provides support and protection to weak, injured, or arthritic ankles. Classic 1 + medical + device. FSA eligible. (1) Unique strapping system provides firm and even support. (2) Open heel allows for a snug, comfortable fit. (3) Seamless design helps prevent irritation. (4) Side stays provide firm support. Sizing: Adjustable - one size fits most, fits left or right ankle. U.S. Shoe Sizes: Fits women's 4.0-14.0 / men's 3.0-13.0. 4 in 1 (1) Reduces inversion-eversion motion in the ankle. 2) Supports ankle throughout workout. (3) Helps protect against ankle injury. (3) Supports ankle without impeding performance. Since 1959 the Mueller family has been the trusted leader in sports medicine. We are dedicated to creating the highest quality products that help people recover and perform at their peak. Engineered in Wisconsin by Mueller Sports Medicine. Family owned since 1959. Trusted brand.