Flexible solid cosmetic composition comprising sulfonate anionic surfactants, fatty esters and fatty alcohols, and cosmetic treatment method The present invention relates to an aqueous cosmetic composition in flexible solid form, comprising (i) at least 10% by weight of anionic surfactants comprising a sulfonate group, (ii) esters of fatty acid(s) comprising at least 12 carbon atoms, and (iii) fatty alcohols comprising at least 16 carbon atoms. The composition finds a particular application as a composition for cleaning or washing keratin materials, in particular the hair. The invention also relates to a cosmetic treatment method, in particular for caring for, cleaning and/or conditioning keratin materials using said composition.
