Under Armour Youth Boys HeatGear UA Tech Embossed T-Shirt 100% polyester UA Tech fabric has an ultra-soft, more natural feel for unrivaled comfort. Moisture Transport System wicks sweat away from the body. Anti-odor technology prevents the growth of odor causing microbes. 100% polyester. Imported. YXS/US7, YS/US8 , YMD/US10-12 , YLG/US14-16 , YXL/US18-20.