Microparticles having a polymeric shell, comprising, based on the total weight of the microparticles: a. from 1 to 20% by weight of at least one acrylic copolymer of HASE type comprising: - at least one anionic monomer having a polymerizable vinyl group and a carboxyl group; - at least one nonionic hydrophobic monomer having a polymerizable vinyl group; and - at least one alkoxylated associative macromonomer having a polymerizable vinyl group and a hydrophobic hydrocarbon chain; b. from 4% to 95% by weight of at least one solid/liquid phase change material, having a phase transition temperature Tf 1 varying from 35°C to 90°C, chosen from waxes of natural or synthetic origin or their mixtures; c. from 4% to 95% by weight of at least one solid/liquid phase change material, having a phase transition temperature Tf 2 of less than or equal to 30°C, for example of less than or equal to 20°C, chosen in the group of vegetable oils, fatty alcohols, fatty acids and their mixtures; and d. optionally from 4 to 95% by weight of an active agent selected from the group consisting of fragrance molecules, flavorings, opacifying agents, hydrating agents, softening agents, refreshing agents, dyes, plasticizers, slimming agents, pharmaceutical active ingredients, inks, pigments, agrochemical active ingredients, herbicides, antiseptics, detergents, enzymes, antifoaming agents, bleaching agents, optical brighteners, biocides, UV stabilizers, antioxidants, corrosion inhibitors, fungicides and antibacterial agents. a. from 1 to 20% by weight of at least one acrylic copolymer of HASE type comprising: - at least one anionic monomer having a polymerizable vinyl group and a carboxyl group; - at least one nonionic hydrophobic monomer having a polymerizable vinyl group; and - at least one alkoxylated associative macromonomer having a polymerizable vinyl group and a hydrophobic hydrocarbon chain; - at least one anionic monomer having a polymerizable vinyl group and a carboxyl group; - at least one nonionic hydrophobic monomer having a polymerizable vinyl group; and - at least one alkoxylated associative macromonomer having a polymerizable vinyl group and a hydrophobic hydrocarbon chain; b. from 4% to 95% by weight of at least one solid/liquid phase change material, having a phase transition temperature Tf 1 varying from 35°C to 90°C, chosen from waxes of natural or synthetic origin or their mixtures; c. from 4% to 95% by weight of at least one solid/liquid phase change material, having a phase transition temperature Tf 2 of less than or equal to 30°C, for example of less than or equal to 20°C, chosen in the group of vegetable oils, fatty alcohols, fatty acids and their mixtures; and d. optionally from 4 to 95% by weight of an active agent selected from the group consisting of fragrance molecules, flavorings, opacifying agents, hydrating agents, softening agents, refreshing agents, dyes, plasticizers, slimming agents, pharmaceutical active ingredients, inks, pigments, agrochemical active ingredients, herbicides, antiseptics, detergents, enzymes, antifoaming agents, bleaching agents, optical brighteners, biocides, UV stabilizers, antioxidants, corrosion inhibitors, fungicides and antibacterial agents.