Tube9 Coolet is manufactured using the advanced high quality 100% AeroCool fiber which has a soft, lightweight and fast sweat absorption. Ideal for all kinds of outdoor activities such as climbing, cycling and golfing.,360 degree stretch for true comfort and fit.Protect your arm from harmful UV Rays (UPF : 50+),Material : aerocool (Nylon 80% + Polyurethan 13% + Polyester 7%),Weight : 18.7g,Size : one size fits most all.