This lightweight, hydrating 3-in-1 leave-in detangles, smooths, and adds definition for the perfect frizz-free air dry, blow dry, or 2-day refresh. It's the first and last step in your routine. This lightweight, hydrating 3-in-1 leave-in detangles, smooths, and adds definition for the perfect frizz-free air dry, blow dry, or 2-day refresh. It's the first and last step in your routine. Founded by celebrity hair stylist Mara Roszak, RŌZ (pronounced “rose”) is a meticulously crafted and curated collection of hair care inspired by nature and rooted in performance.