David Mallett Mask No.1: L'HYDRATATION was originally developed as a special moisturising treatment exclusively for use in the salon. After years of positive experience, however, the mask is now also available to purchase. The main active ingredient in Mask No.1: L'HYDRATATION is Keravis, an extremely powerful protein complex that is also present in its basic form in Conditioner No.1: L'HYDRATATION. In the mask, its enriched formula unfolds intensely, penetrating deep into your hair to provide targeted repair at a molecular level. Mask No.1: L'HYDRATATION creates a silky shine and restores your hair's natural suppleness. It retains its youthful bounce and combats the effects of adverse weather and other challenging environmental conditions.