Support level 1. designed to provide comfortable, even compression. Trusted brand since 1918. Anatomical shape for optimal fit. Fits discreetly under clothing. Breathable, dual-stretch power knit material for comfort. Comfort panel behind the knee. The ACE Brand Compression Knee Support is designed to provide support to stiff, weak or injured knees. Wear during activities which lead to discomfort. Support Level 1: Provides light compression, support and therapeutic heat retention to help relieve symptoms associated with minor sprains, strains and arthritis. Size Selection: for left or right knee, measure around kneecap while in a standing position. Size: S/M; In: 12-17; CM: 30.5-43.2. Size: L/XL; In: 17-22; Cm: 43.2-55.9. Support Level: Provides mild support & stabilization to help prevent re-injury and relieve symptoms associated with strains, sprains, arthritis and repetitive stress injuries. Acebrand.com. Questions? 1-800-537-2191. Acebrand.com. Package is recyclable. Made in China for 3M.