Product details K18 Leave-In Molecular Repair Hair Mask. 4-minute leave-in treatment to clinically reverse hair damage. An At-home Leave-In Treatment infused with the patented K18Peptide that renews hair to its most youthful, healthy state. Benefits: Works to repair even the most extreme damage caused by bleach and color, chemical services, and heat. Creates Like Hair Like New: Traveling into the inner-most layers of hair to reach the core polypeptide chains our revolutionary K18Peptide is just the right size and makeup to reconnect broken chains responsible for hair strength and elasticity. Renews All Hair Types: K18 doesnt just hide damage or patch it up leaving hair brittle, it transforms even the most extreme damage into hair that looks and feels like new. K18 works on all hair types, all generations, all types of expression. Lasting Results That Won't Wash Away: The K18Peptide mimics the natural building blocks of hair and therefore is recognized as naturalso its able to integrate itself with the keratin chains to rebuild and restore hair immediately and over time. Back By Biotech: K18 is the worlds first patented biotech treatment that renews chemically damaged hair from the inside out in just 4 minutes, strength, softness, smoothness, and bounce are restored for hair that looks and feels like new. Specifications Hair Type:Damaged Hair from Bleach, Color, Chemical Services u0026 Heat Assembled Product Weight:0.21 lb Assembled Product Dimensions (L x W x H):2.00 x 2.00 x 4.00 Inches Directions:Instructions IN the Shower: Shampoo, do not condition. OUT of the Shower: Towel dry thoroughly. Begin with 1 pump of the K18 Mask and add more as needed depending on the length, thickness, and condition. Work evenly into hair from ends to roots, one pump at a time. Let sit for 4 minutes to activate. Do NOT rinse out. Style as usual.