The FineForm Sports Bra | From Brooks Running | The Convertible straps on this Brooks sports bra offer two styling options—racerback or open back—and are made with our DriLayer Adapt fabric for a personalized fit. Plus, the straps, neckline, armholes, and back are bonded, for chafe-free movement. These performance-ready racerback sports bras offer great structure without being too rigid, for the best in support, shape, and modesty.