Under Armour is proving its mettle as an apparel warrior. The maker of performance athletic clothing and technology has risen to the top tier of the industry in clothing athletes and active consumers from head to toe. Under Armour is the official footwear supplier of the NFL and MLB and partners with the NBA. Its locker room of athlete endorsers include top performers in football, basketball, soccer, and baseball. Products, made from its moisture-wicking and heat-dispersing fabrics, keep athletes dry and relatively comfortable during workouts. The company is adding technology to apparel to help customers track their fitness. Under Armour sells online, by catalog, through its own retail and outlet stores, and in more than 25,000 retail stores worldwide.