The present invention relates to a composition, preferably a cosmetic composition, in particular for coating keratin fibres such as the eyelashes, comprising: an aqueous phase, a lamellar phase Lβ formed by an aqueous phase-structuring surfactant system, said surfactant system comprising a content of surfactant(s) of greater than or equal to 15% by weight relative to the total weight of the composition, at least one (poly)urethane hydrophilic polymer. The present invention also relates to a process for coating keratin fibres.
