M: suitable for bust 75-85cmL: suitable for bust 86-92cmXL: suitable for bust 93-100cmXXL: suitable for bust 100-105cmXXXL: suitable for bust 110-115cmWire-free Leisure Bras --- Elastic shoulder straps slide from shoulders uneasily and no need to adjust them. Wide design can relieve shoulder burden to provide optimum support. Low U-racerback sports bra design, it is suitable for all kinds of clothes.Cross Front & Adjustable Side Buckles Design --- Lace sports bra for women have 3 row hooks and side buckles in front, provide a double push up power to support breasts more effectively; and the 3-row side buckles provide a gathered and adjust perfect fit you, and make the bra from shifting or slipping, makes you feel more sexy and comfortable.High Elasticity Material --- 93% Nylon + 7% Elastane. There will be some friction between bra and skin during exercise, so when choosing these materials, this fabric is high stretchy, soft, skin-friendly, sweat-absorbing and comfortable to wear.Suitable for Occasion: These seamless wireless sports bras are no longer limited to gym, workout, yoga, walking, jogging. You can put one on even while sleeping, lounging at home, doing chores, daily wear or running errands or any other low-intensity exercise. (Not suitable for some High-intensity Exercise). They are so comfortable that you will barely notice you have anything on.