While Under Armour doesn't report financials by product type, its latest annual report cites training and hunting gear as a significant driver of recent expansion. In 2013, the company's net sales rose by nearly 30% to $2.2 billion -- the quickest growth in two years.
At the end of the day, that's a small price to pay for a fan demographic unlike any other. NASCAR's efforts to inject youth into auto racing should appeal to current Under Armour customers, while the sport's existing fans -- especially those who are older -- should snatch up more outdoor apparel: a win-win for the company.
Jake Mann has no position in any stocks mentioned. The Motley Fool recommends Under Armour. The Motley Fool owns shares of Under Armour. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.