Miracle Bamboo Bra is made of breathable seamless comfy-stretch viscose from bamboo fabric that’s as soft as cotton and smooth as silk to keep you cool all day while getting the best lift, comfort, and support in a bra. No more painful straps or underwires. The seamless design is invisible, and the Miracle Bamboo Bra contours to your shape with all-day comfort and support, it has an easy front closure, and best of all, it's machine washable! 70% nylon/22% viscose from bamboo/8% spandex