The purpose of the notification is the disposable heat cover applicable to treatment and rehabilitation. The disposable heat cover shall take the form of a water-filled flexible foil bag and shall contain an internal container, connected to the upper edge of the container, which is chemically sealed in a water-soluble solid state. The coating in question is characterised by the fact that the bag (1) contains an inner container (3) of flexible plastic foil containing perforation (4),where the inlet of the container (3) is equal to the inlet length of the bag (1),and the bag (1) and the container (3) have a joint zip lock (2).