The UNDER ARMOUR Boys' Tech Half Zip Long-Sleeve Shirt is made of soft lightweight knit construction that delivers superior comfort and breathability. The material wicks sweat to keep him dry and anti-odor prevents the growth of odor-causing microbes. 100% Polyester. Looser cut for complete comfort. Soft, lightweight knit construction. Moisture-wicking. Quick-drying. Anti-odor technology. Anti-pill/anti-pick finish adds extra durability. Generous half?