Hallelujah and pass the champagne! SPANX Power Panties slimming bottoms are the antidote to bizarro-bulges under clingy dresses. We all have that dress (that DRESS!) which is equal parts fabulous-making and torture-device. These SPANX (which go from the waist to mid-thigh) make any silhouette smooth as silk under pretty much anything. Every woman on our team has a pair of these and there's good reason. Hand wash in lukewarm water with an extra-gentle lingerie wash; gently squeeze out excess water and lay flat to dry.