K18 Leave-In Molecular Repair Hair Mask 50ml4 minute leave in treatment to reverse damage This patented bioactive peptide treatment strengthens and improves elasticity while reversing damage from chemical services, thermal styling, and mechanical styling. For all hair types. Hair like new. This leave in mask heals and strengthens hair with lightweight moisturizing benefits to detangle and keep hair smooth and soft, without weighing it down. For best results, use every 4 6 consecutive washes