UA Women's BaseTM 3.0 is the ultimate base layer shirt for cold weather training. UA BaseTM technology fights arctic temperatures in a lightweight package, the comfortable brushed negative grid interior traps and holds hot air for unparalleled warmth.. . 7.0 oz. PolyesterElastane material for strength, comfort and performance. UA BaseTM technology uses brushed negative gridded fabric to trap and hold body heat. 4 way stretch design allows uninhibited mobility. The signature Moisture Transport System wicks sweat away from skin. Anti microbial properties allow multiple odor free uses between washes. Imported.