This separating zipper with lock-down zipper pull has a generous interior flap that prevents chafing. This sports bra provides lined, molded cups for the support and fit you need. Stabilized straps offer added support and minimize movement. The mesh racerback provides breath-ability when you need it. Soft, breathable fabrics and thoughtfully positioned smooth seams minimize irritation of sensitive skin. Compression. Not recommended if you are a small B cup or smaller. Also, select your correct band size. If the band is too small, it puts additional stress on the zipper and can cause it to break