The UNDER ARMOUR Boys' Prototype Pants are made of 100% Polyester material that wicks sweat and dries really fast. Loose and light, it will keep him cool and offer complete comfort. 100% Polyester. Fabric is light, tough and breathable. Moisture-wicking. Quick-drying. Regular fit. Encased elastic waistband with external drawcord. Open hand pockets. Tapered leg fit. Branded taping detail. Inseam: YMD 25" (+/- 2'' per size). Imported.