The K18 Biometric Hairscience Leave In Molecular Repair Hair Mask is a revolutionary hair treatment designed to heal and strengthen damaged hair. It offers lightweight moisturizing benefits to detangle, smooth, and soften hair without weighing it down. For optimal results, use for the first 4-6 consecutive washes following a service, and then every 3-4 washes as needed to maintain hair strength. This mask provides like-new hair repaired from the inside out, healing damage from bleach, color, chemical services, heat, and mechanical styling. It restores strength, softness, smoothness, and bounce while reducing breakage, split ends, and color fade. The product has a pH balance of 5.0-6.0 and doesn't wash away with shampoo, ensuring lasting results. It is vegan, color-safe, and cruelty-free. To use, shampoo hair without conditioning, towel-dry thoroughly, and apply 1 pump of the K18 PRO mask, adding more as needed. Work evenly from ends to roots, with a maximum recommended dosage of 3 pumps. Let it sit for 4 minutes.