Secure zip front closure. Zipper locks into place and inner hooks and eyes keep bra front closed. Wirefree cup is lined, with pockets for removable padding, included. Zipper has 2 hooks and eyes for added security. Features ventilation panels at side front and back. Covered elastic under band . Racerback is great for wide range of shoulder motion. Dry tech knit wick moisture away from you. Sides and back are ventilated.