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HeatGear by Under Armour is a snug fitting t-shirt that can be worn alone or under other clothing. You can wear it under your uniform for unrestricted motion. The HeatGear tshirt is designed to fit tight to your skin, under your outerwear. It snuggly hugs your body to prevent uncomfortable folds. It makes an excellent base layer under body armor. It is 100% polyester. Heatgear is engineered with the Under Armour Fabric, a microfiber blend featuring a signature Moisture Transport System and reliable compression. Available in OD Green and Sand.