The present invention provides an aerosol device comprising: &mdasha container containing: &mdashone or more propellants, and &mdasha composition comprising one or more fixing polymers and/or one or more styling powders comprising one or more water-insoluble inorganic compounds, the propellant or propellants possibly being present in the composition or in the container, separate from the composition, &mdasha means for distributing said aerosol composition, comprising a diffuser having at least three spraying apertures for spraying the composition in a main spraying direction. The invention further provides a method for shaping the hair and/or maintaining the style, comprising a step of applying to the wet or dry hair a cosmetic composition sprayed from a specific aerosol device.
