Tracksmith X J.Crew cannonball short. Introducing Tracksmith X J.Crew, a new collab to help you hit the ground running. We partnered with the Boston-based brand on a capsule of high-performance gear in exclusive colors that can be mixed and matched with our own activewear - for training, racing or taking a rest day. These swim-friendly bottoms are made from a quick-drying, four-way stretch and feature a zippered back pocket. 71% micronylon/29% elastane body and lining. Measurements approximate. Bundle and save. New to Posh? Use code TOOMUCHSTUFF262 to save $10.