Ardour Open Back Square Neck Sports Bra in Black Oh Polly Flex Square Neck Sports Bra Madewell Removable Padded Square Neck Sports Bra High Impact Amazon.com: ODODOS Seamless Square Neck Sports Bra for Women Ribbed. The Anna Kaci sports bra is detailed with a square neckline, wide tank straps, and a completely open cut out back. Features side ruching details. This buttery soft, light weight, breathable, quick drying sports bra is the perfect go to for a cute, comfy, and flattering workout or yoga look. Wear it to your next yoga or pilates class, morning run, hike with friends, or workout at the gym. Finish the look with our matching High Rise Contouring Full Length Leggings for an effortlessly chic gym ensemble. MATERIAL: 73% Nylon, 27% Spandex MEASUREMENTS: Small Bust: 25. 6 31. 7" in Medium Bust: 27. 2 33. 7" in Large Bust: 28. 7 35. 6" in X Large Bust: 30. 3 40. 8" in