The invention relates to a cosmetic process for wrinkled skin, comprising either the topical application to the skin of an extemporaneous mixture of a cosmetic composition comprising a polysaccharide polymer grafted with (meth)acrylate groups and of a crosslinking thiol compound having one or more thiol groups or the sequential application to the skin of a cosmetic composition comprising a polysaccharide polymer grafted with (meth)acrylate groups, followed by the application of a crosslinking thiol compound having one or more thiol groups, or of a cosmetic composition containing same. The invention also relates to the use of the mixture of said grafted polysaccharide polymer and of said crosslinking thiol as a skin tensioning agent. The invention also relates to a cosmetic composition obtained by mixing a cosmetic composition comprising said grafted polysaccharide polymer and said crosslinking thiol. The invention relates to a kit comprising a first cosmetic composition comprising said grafted polysaccharide polymer and a second composition comprising said crosslinking thiol, the first and second compositions each been packaged in a distinct packaging assembly.Linvention concerne un procédé cosmétique pour la peau ridée, comprenant lapplication topique sur la peau dun mélange extemporané dune composition cosmétique comprenant un polymère de polysaccharide greffé avec des groupes (méth)acrylate et un composé thiol réticulant ayant un ou plusieurs groupes thiol ou bien comprenant lapplication séquentielle sur la peau dune composition cosmétique comprenant un polymère de polysaccharide greffé avec des groupes (méth)acrylate, suivie par lapplication dun composé thiol réticulant ayant un ou plusieurs groupes thiol, ou dune composition cosmétique le contenant. Linvention concerne également lutilisation du mélange dudit polymère de polysaccharide greffé et dudit thiol réticulant en tant quagent tenseur de la peau. Linvention concerne également une composition cosmétique ob
