Kerastase Ciment Thermique is the best-selling reconstructive leave-in milk activated by heat. It is designed for weakened and damaged hair that requires repair and protection from the stress of heat styling (blow dryers, straightening or curling irons). It works by strengthening and fortifying hair fiber from the inside out to leave it firm, supple and energised. Kerastase Ciment Thermique can be layered with any other leave-in products for optimal protection. Provides ultimate foundation for long-lasting style, shine and smoothness. Lasting thermo-hold of the active ingredients The use of Ciment Thermique with heat increases the attachment of the reconstructing active ingredients to the hair fibre. This effect lasts up to at least 5 shampoos. Anti-breakage protection The strength of the hair fibre is significantly improved with the use of Ciment Thermique together with heat styling appliances. This effect lasts for one shampoo.