Your son will stay comfortable and warm in the Under Armour Boys' UA Brawler 2.0 Tapered Pants. These pants are made from 60% cotton and 40% polyester smooth tricot knit exterior with a brushed interior for comfort and warmth. The material wicks sweat and dries fast so he stays comfortable, while the encased elastic waistband with external drawstring allows for a secure fit. Under Armour Boys' UA Brawler 2.0 Tapered Pants Mod Gray/Black, X-Small - Boy's Athletic Pants at Academy Sports