Abstract: A cosmetic composition for the hair contains at least one film forming polymer and at least one silicone incorporated into a support consisting essentially of a wax microdispersion in an aqueous liquid vehicle. The dispersed phase of this vehicle is a stable microdispersion of particles having a size lower than 500 nm. The particles consist essentially of a wax or mixture of waxes having a final melting point greater than 60.degree. C. and lower than 100.degree. C. which is capable of forming a microdispersion as defined above. The composition contains from 0.1 to 40 weight percent of wax and a sufficient amount of at least one emulsifying agent. A process for the cosmetic treatment of the hair involves applying the above-defined composition to the hair.