OLAPLEX No 9 Bond Protector is a weightless, leave-in styling serum that's rich in antioxidants to help protect from pollution, heat, and future damage for shine, bounceback curls, and anti-static and anti-tangle action. Use on clean, damp hair. - Delivers shine, style retention, and bounce - Reduces tangles and static - Protects against environmental aggressors and heat - Heat protection up to 450 degrees