Miraclesuit Kirkland Signature by Underwire Shirred One Piece Swimsuit For Women Back and Underpanel: 54% spandex, 46% nylon. Front Drape and Lining: 83% nylon, 17% spandex. One piece swimsuit. Shirring on left side. Underwire support, no padding. Adjustable straps. Miraclesuit shapes and firms the body without bulky linings.