Sebastian’s Professional No.Breaker Leave-In Bonding Spray is the best of both worlds of hair care and styling. Developed for those who love to experiment with their hair but have experienced damage to hair structure through the use of hot tools and chemicals. 87% naturally derived ingredients such as Apple Acid & styling polymers penetrate deep into the hair cuticle, creating new hair bonds and repairing even severe damage caused by hot tools and chemical services.