Athleta‘s first designer collaboration is bound to make Lululemon sweat. Today, the athletic apparel and accessory brand announced its first partnership with Derek Lam 10 Crosby. The capsule collection will incorporate 10 Crosby signatures, like colorblocking and two-in-one styles, in Athleta’s breathable, high-performance fabrics. Expect leggings, shorts, dresses, jackets, sweatshirts and custom sneakers to roll out during three delivery seasons: Fall 2015, Winter 2015 and Spring 2016. The first installment will hit select Athleta stores, Athleta.com and the Derek Lam 10 Crosby boutique in SoHo in September 2015.