Signature Hair SerumA clinically tested hair serum that reduces hair breakage by 83%* while protecting against heat styling up to 450F*. Lightweight and fast absorbing, this anti frizz serum glides on like silk and disappears instantly. What's left behind? Mirror like shine and featherlight smoothness, with zero grease, zero weight, zero residue. Use it on wet hair before blow drying, on dry hair to tame flyaways and refresh your style, or as an overnight treatment for