Shop boys' underwear in red, blue, green, yellow, gray, and many more interesting colors. The infamous NBA star Stephen Curry is the brand ambassador of Under Armour’s Footwear line. Triple Pte Limited, Endomondo Organization, MapMyFitness Inc., etc., are the Under Armor subsidiaries. Blue vibrates magically with trust and loyalty. Choose your Under Armour Blue Underwear for boys made from wide varieties of material such as Polyester and Blend. Each material provides different look and feel of Under Armour Boys Underwear.