Want to slim your tummy and shape your derriere? Look no further than the new Slim Cognito from Spanx ;. The Control Panty is seamless, and is made from a luxurious, slick yarn combination, that won't stick to your clothes. They have a non-binding waistband, so they won't dig into you and ruin your silhouette. They also have the amazing 'butt separator' to avoid 'flat-butt' syndrome.