... .Breathable,breathable,sunproof ,Anti-UL Product descriptions:Cycling arm sleeve arm protector GERMINATIONFabric:Combination of Polyester and spandex,mesh clothColor ... espeically some a little cold morning ,it keeps your arm warm,and easy taking off when it gets hot ... elastic and comfortable wearing without feeling constrictions. Customs designs arm sleeves are acceptable, pls feel free to inquiy about ...