Under Armour, Inc. (NYSE: UA) (NYSE: UAA) has done something no other company has done in the past generation: Present a credible threat to Nike (NYSE: NKE) and Adidas (ETR: ADS).Since its founding in 1996, Under Armour has grown dramatically to become the #2 sportswear brand in the U.S., surpassing Adidas. The company was worth more than $20 billion before its recent troubles, and a major reason for its success has been its focus on innovation and technology with its compression t-shirt and other similar performance-enhancing products.But there's one area where the company seems to have gotten off track.