Just wet it with cold water and shake to activate,Keeps cool for hours .That’s wonderfull.This is a cooling towel featuring with a physical cooling, sweat absorbing, breathable, light and soft texture.Cooling towel stays 15 to 20 degrees cooler then the air. Cools with no chemicals. This towel is good for running, Relay for life, Golf outings, Any event where people are in the sun or a hot environment. Wear it around you neck. The price includes the shipping cost to ca, QTY over 10000pcs by ocean.100% guarantee for quality, Thanks for your order.