The L'Oréal Professionnel Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing 250ml is a nourishing treatment designed to smooth and soften the hair after cleansing. Featuring a sumptuously rich texture, the formula coats the lengths with conditioning nourishment while helping to support the strands for a sleeker feel. Applied after shampoo and left for five minutes, the mask helps reduce the appearance of flyaways, while leaving hair feeling hydrated and easier to manage. The result is hair that appears smoother and glossier without feeling weighed down. Results: Reprograms hair for up to 2 weeks of frizz control* Up to 5x smoother hair and 2x less frizz** Controls unwanted volume for daily styling in half the time*** Provides up to 3x less unwanted volume**** Helps protect hair from hair breakage and improves softness from the first use***** Delivers instant shine that lasts up to 5 days***** *Consumer test on 68 participants, 1 application/week for 4 weeks. Based on 15-day break observation. **Instrumental test after 4 uses of Smooth Transformer. ***Instrumental tests with 4 uses of the Shampoo + Smooth Transformer + Serum routine. ****Instrumental test. *****Instrumental test after 1 application of shampoo, mask & serum.