The cooling suit, consisting of a suit for legs, torso and arms, includes inwardly branching gas channels, with a plurality of outlets, from a tube sleeve opening outwards in the hip region. There is also a compressed gas cylinder (17) for wearing with the suit and connecting the outlet tube (19) thereof to a coupling part (20) on said tube sleeve, and which comprises a valve (18) and a setting wheel (24) for the metered discharge of expanded gas into the gas channels. The gas channels in the upper part of the suit comprise outflow openings in the region of the lower back, at the hips and in the neck region, in the armpits, on the inner sides of the arm joints and the inner sides of the sleeves. In the lower part, i.e. in the trouser legs, outflow openings are arranged in the hollows of the knees and in the region of the crotch. Said cooling suit is operated using a dry compressed gas that is carried in the compressed gas cylinder (17). The gas flowing out of the compressed gas cylinder (17) is expanded, subsequently cooled and then flows through the gas channels and cools the body of the wearer at the outflow openings. Perspiration is transported away by the continuous supply of gas via the breathable material of the suit.