Uniform compression for weak or injured elbow. Unique seamless design ensures comfortable fit and even compression. Breathable material for all day comfort. Reinforced edges for durability. Durable material permits a full range of movement while delivering comfortable support and protection. Contoured to natural bend of elbow to minimize bunching and slipping. The Ace Brand Knitted Elbow Support is designed to provide you with the optimal support you need while assuring proper fit and comfort. Provides light compression, support and therapeutic heat retention to help relieve symptoms associated with minor sprains, strains and arthritis. Measure elbow at widest point. Small: 9 to 11-1/2 inch. Medium: 11-3/4 to 13-3/4 inch. Large: 14-16 inch. The Ace Trademark is your assurance of superior quality, support and comfort. 3M guarantees your complete satisfaction or your money back. Made in China for 3M.