Women"s Climate Control Vest Evaporative Cooling (HyperKewl) - this simple and effective technology works by combining water with our HyperKewl Fabric to create garments that gradually release water through evaporation to keep you cool, but comfortable. Design especially for the Ladies, the Hyperkewl Evaporative Deluxe Sport vest features a high mandarin collar for additional cooling relief and sun protection. The handy front pockets with zipper closure are great for the Equestrians and bikers. Per soaking you will receive from 5 to 10 hours of cooling relief. The sport vest is a lightweight quilted Nylon with a polymer embedded fabric inner. Inside is a water repellent nylon liner.