While wearing these new kids' shorts, older children can run, jump and play without getting too hot! This pair is made from an easy-care, quick-drying, and moisture-wicking material that feels cool against the skin. They're perfect for sports and gym lessons! The finishing treatment in Reima's Xylitol Cool material creates a cooling sensation against the skin. It also makes the skin surface temperature drop by 1 to 3 degrees! The cooling effect is the result of using xylitol and erythritol, which are edible sweeteners, so it's 100% natural.