Ergodyne - EGO12583 Made with advanced PVA cooling technology, 6710CT Cooling Bandana Triangle Hats keep your head cool in the heat. Submerge hats in water to quickly activate the evaporative cooling process. Cooling technology will keep you cool for a few hours. Reactivate the process by soaking hats in water. Comfortably wear these lightweight, nonbulking hats with the secure tie closure that conforms to your head size so you do not have to readjust the fit. Wear them during strenuous activities or working outside to stay cool. Patented design provides uniqueness.