Designed with absolutely no buckles, clasps or underwires that can pinch, squeeze or press on your skin. The contour ribbed soft-straps are just wide enough without being conspicuous. All-in-all a perfect combination of shape and cool comfort. Our bamboo fabric maintains its shape and is great for sensitive skin. Bamboo fibers are not chemically treated. These fibers are naturally smooth and round with no sharp spurs to irritate skin. 80% rayon made from bamboo, 13% nylon, 7% spandex.