One Piece Sponge Butt Shaper Underwear is an essential way to create the curves you seek. Look fuller instantly in your leggings, jeans or dress with a smooth, natural look. Butt shaping underwear is durable but require handwashing to maintain shape. Simply wash in cool water with lingerie wash, no bleach and lay flat to dry. We recommend Forever New Lingerie wash for a clean rinse, available at Exotic Peach.