Lightweight performance wear experience what its like to feel cool and dry in under armours baselayer heatgear kids mid shortmade from polyester and elastane the thin and minimalist approach is designed for a snug fit to sit beneath other layers while the elasticated waistband helps keep the shorts securely in place during any action with heatgear providing a cooling and dry presence in the fabric as the temperature rises then youll still be left in complete comfort and able to performs