Lululemon AthleticaApparel maker Lululemon Athletica ( LULU) is on the exciting end of a big trend in sportswear. The firm was a pioneer in the yoga apparel niche, launching stylish workout gear at the exact same time yoga started to become extremely popular with American consumers. Today, the Vancouver-based firm also boasts more than 220 retail stores spread across the U.S., Canada, Australia and New Zealand. >>5 Cash-Rich Stocks to Triple Your Gains Lululemon's position in the market gives it the ability to collect premium prices for its merchandise -- and it shows. The firm generated around $2,000 per square foot of retail space at its company owned stores last year, making it one of the most productive apparel sellers out there. Third-party sales channels offer LULU a zero-risk way to move its workout gear, especially as competitors vie for LULU's customers and brand fragmentation becomes more apparent. As Lululemon moves from being a yoga-wear maker into more general athletic apparel its strong brand should help it maintain a niche advantage. Despite its upside prospects, LULU is best known on Wall Street for being a volatile name. That's helped push its short interest ratio to 11.9, a level that makes it a short squeeze candidate. Any hint of earnings surprise next week could spark fast buying. Keep an eye on this one.