Shares of Under Armour (NYSE:UA) are up nearly 70% so far this year, even despite a recent pullback on concerns for the athletic apparel specialist's growth in 2014.

Even so, the Fool's Steve Symington thinks shares of Under Armour are plenty attractive at today's levels. So attractive, in fact, that, as he explains in the video below, he'll soon double his personal position in Under Armour stock in the very near future. Keeping in mind that Under Armour currently represents around 4% of his personal portfolio, check out the video to get Steve's full take.

What do you think? Are shares of Under Armour worth buying today?

Fool contributor Steve Symington owns shares of Under Armour. The Motley Fool recommends and owns shares of Nike and 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.