The invention relates to cosmetic formulations containing, as a thickener, amphiphilic comb polymers having a high content of hydrophobic monomers and polyalkylene glycol monomers. Said polymers are provided in the form of solid particles dispersed in water and have a weight-average molar mass of about one million grams per mol. When salified, the polymers become water-soluble and can efficiently thicken a cosmetic formulation containing the same, especially at a pH ranging from 5 to 7, thus making the polymers particularly suitable for cosmetic formulations to be applied to the skin, in particular make-up and body care products.