Lululemon Run The Day Bra Black Sports Bra Top Size 4. In excellent condition. We designed this soft, long-line bra to feel like nothing at all but with a little more support. The magic lies in Nulux™, a sweat-wicking fabric that dries quickly, and gives (almost) weightless coverage. A Mesh fabric panel and the deep V in the back give you ventilation during hot classes. Slip in the optional, removal cups for a little extra coverage—if you want it. This bra is intended to provide medium support for sweat ethusiasts with an A-B cup.