BOOST IT Mousse’s Double-Hold formula gives you instant XL volume & up to 48H* endurance. Achieve unlimited styling possibilities, & keep the volume up! L' Oréal Paris Studio Pro Boost It Volume Mousse, for BIG HAIR junkies. Who do you want to be today? Try a new look every day; go from Poker Straight on Monday, to Hippie on Wednesday then to Backcomb Bombshell on Friday. With Studio Pro & the exclusive Double-Hold formula, change up your styling routine! * Instrumental test vs. reference shampoo.