Abstract: The invention relates to a cosmetic composition for coating keratin fibers, comprising a dispersion of particles in a cosmetically acceptable medium, the particles comprising at least one at least external supple phase, comprising at least one supple polymer having a glass transition temperature of less than or equal to 60° C. and at least one at least internal rigid phase, which is an amorphous material having a glass transition temperature of greater than 60° C., the supple polymer being at least partially attached by chemical grafting onto the rigid phase. The invention also relates to a process for coating keratin fibers, comprising the application of the composition to the keratin fibers. The composition rapidly gives a makeup with good eyelash curling properties.