Why Parents Love Under Armour HeatGear® & ColdGear® Technology — Regulates body temperature so little ones stay comfortable in any season 4-Way Stretch Fabric — Moves with your child through every crawl, climb, and sprint Moisture-Wicking Performance — Pulls sweat away from skin to keep kids dry and focused Durable Construction — Built to withstand the wear and tear of active play, wash after wash UPF Sun Protection — Available on select styles for outdoor adventures Shop by Age & Activity Whether you're outfitting a newborn, a toddler on the go, or a young athlete gearing up for the season, our Under Armour collection has the right fit. Browse tops, bottoms, outerwear, and accessories designed specifically for growing bodies.