Under Armour® Baseball Equipment: performance gear for the diamond. Under Armour Baseball equipment features baseball gloves, baseball hats & caps, sliding shorts, bat bags, equipment bags, socks, jock straps, and accessories to keep you protected on the diamond or in the cage. Under Armour® clothing technology transports moisture; ColdGear keeps you warm when it’s cold, Heatgear keeps you cool when it’s hot. Under Armour© Performance - Global Site Headquarters. Under Armour® clothing, performance apparel, and sports clothing for the serious athlete.