Maelys Cosmetics B-TIGHT Lift & Firm Booty Mask NWT Factory Sealed Firm Butt. Strong Strut. Get a firmer-looking booty with this bestselling leave-on booty mask that is clinically proven to reduce the appearance of cellulite and visibly firm the skin around the booty and thighs. 100 mL. / 3.38 Fl Oz.