Kérastase Resistance Strengthening Hair Mask is a restorative treatment for extremely damaged hair. It intensely strengthens hair to protect against breakage, resulting in smoother, softer hair with enhanced shine. Suitable for medium and thick hair types, and compatible with all hair textures including straight, wavy, curly, and coily hair. It targets hair concerns such as damage, split ends, breakage, dryness, and lack of shine. Key ingredients include Gluco-Peptide, Wheat Protein Derivative, and Native Plant Cells, which help strengthen, smooth, and intensely hydrate hair. Usage involves applying generously after shampooing, leaving on for 5 to 35 minutes depending on hair type, and rinsing thoroughly. For best results, use with other products from the Kérastase Resistance collection.