Even the rattiest of kids can't duct-tape or shoo-goo a pair of Vans beyond matter of months. Skate culture (and shoes) have a huge overlap with the world of streetwear. Thus the skate shoe market spins in a rare confluence of fashion and function that we might call a no-brainer. Or goldmine. Or what Mark G. Parker, Nike's chief executive and president, did in fact call a “unique consumer segment … underserved in terms of product innovation.” Seven months ago, action sports represented $390 million of Nike's business, up 120 percent since 2007, the fastest-growing category within the brand. The company aims to double this figure by 2015.