Control Hair Frizz: Kerastase Hair Mask Written by Kendall Boysen on April 15, 2016 Smooth-in-motion mask provides maximum frizz control and extreme softness Daily deep conditioning mask Provides maximum frizz control, extreme softness and suppleness Seals ends to help prevent future blowdry damage For Fine to Coarse, Unmanageable Hair How to Use: Apply a quarter-size amount to wet hair (mid-lengths and ends). Massage through. Leave on for 5-10 minutes and rinse thoroughly.