Designed to provide comfortable, even compression. Size Selection: For left or right knee, measure around kneecap while in a standing position. Large: 17-19.5 inches (43.2-49.5 cm). The Ace Brand Trademark is your assurance of superior quality, support and comfort. Trusted brand since 1918. Fits discreetly under clothing. Breathable, dual-stretch power knit material for comfort. Anatomical shape for optimal fit and joint protection. Comfort panel reduces bunching behind the knee. The Ace Brand Knitted Knee Support is designed to provide support to stiff, wheat or injured knees. Wear during activities which lead to discomfort. Provides light compression, support and therapeutic heat retention to help relieve symptoms associated with minor sprains, strains and arthritis. Made in China for 3M.