K18 Full-size Leave-In Molecular Repair Hair Mask New in Box

K18 Full-size Leave-In Molecular Repair Hair Mask 4-minute leave-in treatment to reverse hair damage New in box A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18PEPTIDE™ is clinically proven to repair damage from bleach + color, chemical services and heat* – with immediate and lasting results to restore strength, softness, smoothness and bounce to hair.