When overflowed, it feels cool and cool.Cooling Arm Cover with Pass-Written Touch Cooling Sensation for a Cool Feel Every Touch The back is mesh so it looks cool and doesnt get stuffy. The main upper part is made of 50% natural fiber cotton and 50% natural soybean fiber for a smooth and comfortable fit. The tip of the finger is cut in the middle so you can operate your smartphone while wearing it. The long type design protects your upper arms. It feels cool when overflowing with a cooling sensation that passes the place where you touch it, so you can feel cool and cool every time. The back is mesh so it looks cool and doesnt get stuffy. The main upper part is made of 50% natural fiber cotton and 50% natural soybean fiber for a smooth and comfortable fit.