Keep him comfortable and safe in the Under Armour® Boys' HeatGear® Sonic Sleeveless Top. The UPF 50+ sun protection keeps his skin safe from the sun's harmful rays and the blend of 84% polyester and 16% elastane with Moisture Transport System that wicks sweat and dries quickly. Anti-odor technology keeps his gear fresh. The smooth, antipick, antipill fabrication offers durability, and there is a screen-printed UA logo on center of the chest. Sleeveless. Fitted.