Bumble & Bumble's #1 bestseller. The multitasking leave in treatment for all hair types instantly cuts frizz by 50% when compared to untreated hair (all day, even in extreme humidity). Plus, it provides heat protection up to 450°F/232°C, has UV Filters to help protect hair against the drying effects of the sun, protects color from fading for up to 16 washes, detangles to help protect against breakage, smoothes, softens, and adds shine. Now that’s a real multitasker.