The Kérastase Masque Force Architecte is an intensive mask treatment for weak, damaged or brittle hair. This rich formula penetrates deep into the fibre of the hair to moisturise & rejuvenate, making it the perfect treat for thirsty, weakened hair that's suffering as a result of heat styling, dying or pollutants. Kérastase's Masque Force Architecte treatment has been specially designed to nourish, heal & fortify damaged hair at erosion levels 1-2, which is a scientifically formulated scale created by Kérastase for analysing hair damage. With the active ingredient Vita-Ciment® – which contains Intra-Cylane, Ceramide R, Pro-Keratin & Sève de Résurrection – this mask revives & renews the hair from root to tip, strengthening the hair fibre to protect against split ends, brittleness & breakage. After your usual hair-care routine, apply 1 or 2 walnut-sized amounts to towel-dried hair. Massage into lengths & ends & leave on for 5 to 10 minutes to allow the creamy formula to penetrate into the strands. Rinse thoroughly to reveal noticeably soft, shiny & revived hair.