New Blue Cat Team Bicycle Sleeve Warmers Cycling Sleeves Arm Warmers Material: polyester 20%; Spandex Fiber 80%, skidproof silicon strap Quick-dry function and make you feel more comfortable. It can keep you dry and cool in the hot condition and warm in cold condition. Wear and put off easily, convenient to use. Add the skid-proof silicone band inside this arm sleeve on the top, avoid skid down.