Stay comfortable when you're on a long hike or stalk even in the hottest weather with a HeatGear™ long-sleeve tee shirt. HeatGear is engineered with the Under Armour® Fabric™, a microfiber blend featuring Under Armour's signature Moisture Transport System and reliable compression. Wicks sweat away from the skin and dries four times faster than cotton. Field-tested in simulated summer training-camp conditions, Under Armour garments kept the core body temperature of each wearer much cooler than subjects wearing cotton. This lightweight microfiber is designed to fit tight to your skin, under your outerwear. Made in USA and Imported.