Lins Sports Captain America One Pair Cycling Arm Warmers Outdoor Sport Arm Sleeves Cuff Sleeve Covers Uv Sun Protection Racing (XL) Material: polyester, spandex. Thin, lightweight and elastic fabric for freedom of movement. Riding cuff with good flexibility, fit the body curve, thereby reducing drag brought by high speed riding. According to the principles and characteristics of sport riding ergonomics, uses 3D cutting to create a professional, reasonable and comfortable, stylish cycling clothing. UV Protection keeps sunburn at bay and cool feeling finish.