Bag a baselayer for your workouts. This men's HeatGear Long Sleeve Top from Under Armour is light and stretchy. HeatGear tech removes sweat. Mesh panels keep you ventilated. Signed off with signature branding. Machine washable. Material: Polyester 84% ; Elastane 16%. This top features a regular fit, a crew neckline, and is made of polyester. It is designed for adults and is white in colour.