K18 Leave-In Molecular Repair Hair Mask is a revolutionary leave-in treatment that uses biomimetic hairscience to repair and restore damaged hair at the molecular level. This 15ml concentrated formula works to reconnect broken keratin chains within the hair structure. Key features: • Leave-in treatment - no rinsing required • Biomimetic hairscience technology • Repairs hair at molecular level • 15ml/0.5 fl oz size • Concentrated formula • Reconnects broken keratin chains The K18 mask utilizes a unique peptide technology that penetrates deep into the hair cortex to repair damage from chemical services, heat styling and environmental factors. Unlike traditional masks that coat the hair surface, this leave-in treatment works progressively with continued use to restore hair's strength and elasticity from within. The compact 15ml size is perfect for travel or trial use.