The UNDER ARMOUR Boys' Prototype Shorts are made of 100% Polyester material that wicks sweat and dries fast. Loose and light, it will keep him cool and offer complete comfort. 100% Polyester. Looser cut for complete comfort. Material wicks sweat & dries really fast. Encased elastic waistband with internal drawcord. Mesh hand pockets. Inseam: YMD 8.25" (+/- 1.5" per size). Imported.