K18 Leave-In Molecular Repair Hair Mask is an innovative biomimetic hair treatment that works at the molecular level to repair and restore damaged hair. This 50ml leave-in mask requires no rinsing and utilizes advanced hairscience technology to deliver deep repair benefits. Key features: • Leave-in formula with no rinsing required • Molecular repair technology • Biomimetic hairscience formula • 50ml/1.7 fl oz size • Professional salon-quality treatment K18 is known for its patented biomimetic peptide technology that works to repair damage from chemical services, heat styling and bleaching. The mask should be applied to clean, towel-dried hair and left in - no rinsing needed. The product comes in a sleek white bottle with minimalist branding featuring the K18 logo and biomimetic hairscience trademark.