Kérastase Résistance Masque Extentioniste Hair Mask is an intensive strengthening treatment for long, weakened hair prone to breakage. Its rich formula deeply nourishes, detangles, and reinforces damaged strands while improving elasticity and helping seal split ends. Hair is left softer, smoother, shinier, and more resilient from root to tip.

Length strengthening hair mask for slow growing, damaged lengths.