The Under Armour Boys' ColdGear Armour Mock Long Sleeve Shirt keeps you warm and dry without being bulky or riding up. It is made from a dual-layer fabric with an ultra-warm, brushed interior and a smooth, fast-drying exterior. Stretch-mesh back and underarm panels provide strategic ventilation and anti-odor technology prevents the growth of odor-causing microbes. Stay focused all season long with the Under Armour Boys' ColdGear Armour Mock Long Sleeve Shirt. | Under Armour Boys ColdGear Armour Mock Long Sleeve Shirt