K18 Leave-In Molecular Repair Hair Mask is a revolutionary biotech treatment that repairs chemically damaged hair from within. This professional-grade formula works in just 4 minutes to restore strength, softness and smoothness to damaged hair without requiring rinsing. Key features: • Patented biotech peptide formula • Works in just 4 minutes • No rinse required - leave-in treatment • Repairs chemical damage from inside out • Restores strength and softness • Professional-grade formula • 15ml size provides 5-15 treatments The K18 mask uses biomimetic technology to repair hair at the molecular level. The unique peptide formula reconnects broken keratin chains within the hair structure, providing lasting repair rather than just temporary surface treatment. For best results, apply to towel-dried hair after shampooing and before any other styling products. One pump is typically sufficient for shoulder-length hair. The 15ml bottle contains enough product for approximately 5-15 treatments depending on hair length and thickness.