Adaptable protective device suitable to include a portion of body to protect comprising - a main casing impermeable to the passage of fluid, flexible and defining a main volume, said main casing being suitable to be placed at least partially around said portion of body to protect so that said portion of body to protect is outside said main volume, - said main casing defining an inner surface substantially in contact with said portion of body to protect and an outer surface not in contact with said portion of body to protect, - an inner casing placed inside said main casing, permeable to the passage of fluid and flexible; - a plurality of filler particles housed in said inner casing; - a first valve suitable to form or interrupt a connection for fluid passage between said main volume and the external environment and suitable to permit the depressurisation of said main volume defining a relaxed configuration in which said filler particles are movable inside said at least one inner casing; and a compressed configuration in which said filler particles are compacted and substantially define at least one solid body, - characterised in that it comprises - a closure casing impermeable to the passage of fluid, flexible and comprising sealing means suitable to create a fluid seal between said closure casing and said portion of body to protect thereby forming a closed volume impermeable to the passage of fluid and including said main casing and said portion of body to protect, - a second valve suitable to form or interrupt a connection for fluid passage between said closure volume and the external environment and suitable to permit the depressurisation of said closure volume defining a closed configuration in which said closure casing is depressurised and the atmospheric pressure presses, in all directions, said inner casing against said portion of body to protect. - a main casing impermeable to the passage of fluid, flexible and defining a main volume, said main casing being suitable to be placed at least partially around said portion of body to protect so that said portion of body to protect is outside said main volume, - said main casing defining an inner surface substantially in contact with said portion of body to protect and an outer surface not in contact with said portion of body to protect, - an inner casing placed inside said main casing, permeable to the passage of fluid and flexible; - a plurality of filler particles housed in said inner casing; - a first valve suitable to form or interrupt a connection for fluid passage between said main volume and the external environment and suitable to permit the depressurisation of said main volume defining a relaxed configuration in which said filler particles are movable inside said at least one inner casing; and a compressed configuration in which said filler particles are compacted and substantially define at least one solid body, - characterised in that it comprises - a closure casing impermeable to the passage of fluid, flexible and comprising sealing means suitable to create a fluid seal between said closure casing and said portion of body to protect thereby forming a closed volume impermeable to the passage of fluid and including said main casing and said portion of body to protect, - a second valve suitable to form or interrupt a connection for fluid passage between said closure volume and the external environment and suitable to permit the depressurisation of said closure volume defining a closed configuration in which said closure casing is depressurised and the atmospheric pressure presses, in all directions, said inner casing against said portion of body to protect.