Shop › K18 Leave-In Molecular Repair Hair Mask Image 1 of 1 K18 Leave-In Molecular Repair Hair Mask $79.00 Leave-in repair treatment designed to help improve softness, strength, and resilience after heat, color, and styling stress. Add To Cart Added! Leave-in repair treatment designed to help improve softness, strength, and resilience after heat, color, and styling stress. You Might Also Like K18 HeatBounce Conditioning Heat Protectant $49.00 K18 Molecular Repair Hair Oil $69.00 Medical Wig Care Kit $99.99 Luxury Repair Kit $179.00