Made up of two parts: the internal part, realized by HFW techniques two robust sheets of PVC with no sems, containing polystyrene spheres; the external part is made of nylon and has eight handles, which allow transportation and also protect from scratching. The on/off valve made of chromed brass with a built-in fitting for rubber tube is resistant to any temperature and guarantees unlimited duration. The reduced dimensions make it particularly functional for use on stretchers and where there are problems with storage space.