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. Clinical Results Our formulas go through rigorous clinical trials conducted on panels of real women. The trial found that B-TIGHT is: * Clinically proven to significantly increase booty smoothness.Clinically proven to significantly increase booty skin firmness.Clinically proven to significantly decrease booty roughness.Clinically proven to visibly firm skin around the booty and thighs.Clinically proven to give a tighter-looking booty. *Based on a 56-day clinical trial with 30 participants.