Under armour coolswitch boys tee shirt the under armour coolswitch boys tee shirt is constructed using the heatgear fabric to wick sweat away from your skin pulling it to the garments surface and allow it to evaporate with ease this will allow your body to stay coold dry and light and ensure you can keep exercising for longer tee shirt crew neck short sleeve under armour branding flat lock seams body 90 polyester 10 elastane machine washable black 7 8 sb