High performance fabric kills 3 birds with one stone: block the sun, support arm muscles and keep 'cool '. Ergonomically designed for full range of motion. Flat seams reduce irritation caused by chafing Anti-slip design: never have a problem with them sliding down your arms at all. Perfect for sports activities and daily outside work. Comfortable size: made from stretchy material, suitable for men and women (please view chart on the right).