Under Armour Junior Heatgear Short Sleeve T-Shirt polyester HeatGear Technology - designed to keep you cool dry and light. Acting as second skin layer HeatGear wicks sweat away from the body and moves it to the fabrics surface where it evaporates Ultra-lightweight UA Tech fabrication in shortsleeve, crew-neck design. Moisture Transport System - Under Armour's signature Moisture Transport System wicks moister from your skin, keeping you dry and your body temperature consistent in any condition Raglan sleeve construction - with Flatlock seams rolled off the shoulders for chafe-free comfort.