4-way stretch - MD/LG. Provides support to weak, injured, or arthritic ankle joints. Sports Medicine. Thermo reactive technology. Improved recovery time. Absorbs natural heat and reflects far infrared back to the skin, helping the body recover. Class 1 medical device. FSA eligible. (1) Thermo reactive technology. (2) Helps protect against ankle injury. (3) 360 degrees targeted compression. (4) Lightweight breathable material. Sizing: Size MD/LG fits left or right ankle. US shoe sizes fits women's 10.0 - 14.0. Men's 9.0 - 13.0. Not made with natural rubber latex. 3-in-1. (1) Reduces inversion-eversion motion in the ankle. (2) Supports ankle throughout workout. (3) Helps protect against ankle injury. 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. Trusted brand. Family owned since 1959. Engineered in Wisconsin by Muller Sports Medicine.