Like our long distance Arctic flying friends who migrate pole to pole, this sports bra is built for our toughest traverses. With serious compression, a four strap system built to support larger cup sizes, and a first class breathable, wicking poly/spandex blend, this is the bra for the extra mile. By Oiselle. 32-40 C, D, DD. Best for D/DD Bra Support Level: 4 out of 5 Barbells Best for running 78% poly/22% spandex Oiselle Sisters Bra Fits a bit on the snug side, I’m normally a 32D and sized up.