HyperKewl 6536-BK Evaporative Cooling Skull Cap 60% HyperKewl,40%Nylon Imported This product is highly durable Easy to use This product is manufactured in United States Uses Hyperkewl Fabric to cool for 5-10 hours One Size, comfortable fit with tie closure in the back Several color options available No slimy residue or swelling gel or crunchy chemicals