K18 Biomimetic Hairscience Professional Leave-In Molecular Repair Mask 1.7 fl. oz

This salon-grade, leave-in treatment repairs hair on a molecular level in just 4 minutes. Powered by the biotech-developed K18PEPTIDE™, the formula reconnects broken polypeptide chains (and, as a result, disulfide bonds) to restore strength, softness, smoothness and bounce — delivering immediate and lasting reparative results for damage from bleach + color, chemical services and heat.