This professional leave-in treatment mask repairs hair damage and restores hair to a healthy state after salon services. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes. This mask is clinically proven to repair damage from bleach* + color*- chemical services*- and heat* for immediate + lasting results. Cream-based format helps soften- smooth- and condition hair. Benefits: K18PEPTIDE™ is a biotech-developed peptide that mimics hair's structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during bleach- color and chemical services- and heat*. K18Pro pH-optimized (5.0-6.0) to help minimize cuticle swelling + put hair proteins in their most resilient state after salon service or shampoo Cream format enables easy- lightweight application across all hair types- with detangling and softening benefits. Vegan- color-safe- cruelty-free How To Use: The K18 professional molecular repair hair mask is meant to be used as the second part of the K18REPAIR™ service (K18 PRO mist + K18 PRO mask). With A Color Or Chemical Service: Before the service- apply K18 professional molecular repair hair mist. Wait 4 minutes. Do not rinse out. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density- starting at the ends and working up towards the roots. Let sit for 4 minutes. Do not rinse out. Proceed with cut or style as usual. If toning- use K18 PRO mist first- wait 4 minutes- then apply toner directly over PRO mist. Process as usual. Rinse or shampoo toner + apply K18 PRO mask per instructions above. Without A Chemical Service: Shampoo- do not condition. Towel-dry thoroughly Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density- starting at the ends and working up towards the roots. Let sit for 4 minutes. Do not rinse out. Proceed with cut or style as usual.