The Under Armour 2321 youth performance tech tee shirt for kids feels like cotton, but performs like Under Armour. Providing the ultimate in moisture management, you'd never know that this shirt isn't cotton. The power stretch fabric and FLATLOCK seams, help deliver enhanced mobility. The center chest performance UA logo provides a great look for the lightest weight tee on the market. Great for football, hockey, baseball, basketball, soccer, on the street, and other fitness and athletic activities.