Kerastase Nutritive Masque Magistral Mask for Severely Dried Out Hair is a weekly use moisture rich hair treatment. Helps to restore your hairs natural moisture levels and prevent it from drying out due to heat styling and environmental aggressors. Can be used by straight, curly, or wavy hair. Helps to leave hair ultra soft, full of shine and tangle free. Protects hair from breakage due to heat styling. Perfect for those with brittle hair.