This magic single layer cooling towel is made of 100% polyester with cooling fibber gently wringing the wet towel out and shaking several times only few seconds it becomes cool about 15 degree bellow outdoor temperature. It is light weight refreshing has 4.98% UV blocking rate and 30+ UV protection index. This product is 100% chemical-free and physical cooling effect normal temperature water even 90 degree hot water and sweat can generate cooling effect just in few seconds. It is machine washable works great for sports outdoor activities and hot environment works. Do not bleach the towel and leave the towel in high temperature/high humidity for a long time the edge of the towels may become loose and curl after long washing or use do not fold when it is hard and dryer is not recommended.