Hair colouring techniques have changed a great deal over the last few years, and subsequently the hair now has a very different porosity from the roots through to the tips. To help combat damage and restore porosity, we created LEAVE-IN.REPAIR – the added benefit of a leave-in treatment is that it continues working for up to 24-hours. From first use, LEAVE-IN.REPAIR improves overall condition and manageability, and with continued use, and as part of our REPAIR regimen, hair quality will continue to improve over time.