Baleaf Cycling Men One Pair Outdoor Sport Cooling Arm Sleeves UV Sun Protection Material: polyester, spandex. Thin, lightweight and elastic fabric for freedom of movement. Anti-skid silicone on the upper cuff to prevent the arm warmer slip off. Ergonomically placed seams follow the moving body. Length: S 40CM, M 41.5CM, L 44CM, XL 45CM, XXL 48CM.