It is provided a supporting device (1) comprising an outer wrapper (2) impervious to gas passage and adapted to define a housing volume (2a)； an inner wrapper (4) permeable to gas passage, defining an operating volume and adapted to be housed within the housing volume (2a)； separation means (5) adapted to divide the operating volume into a plurality of sub-volumes (5a)； and at least one valve (7) suitable to create, upon command, a connection for fluid passage between the housing volume (2a) and the external environment so as to vary the extension of the sub-volume (5a) and define an expanded configuration in which the distinct particles can freely move inside the sub-volumes (5a), and a compressed configuration in which the distinct particles (6) become compacted defining a plurality of resistant elements (6a).
