Constant temperature undershirt

The utility model is suitable for an articles for daily use field provides a constant temperature undershirt, include: the undershirt body is located the interbedded pipeline of undershirt body, and is provided the device with constant temperature source that pipeline both ends are connected, and the device includes: water bag, miniature pump, power and locate refrigerant or the heat accumulator in the water bag, miniature pump's import and water bag intercommunication, miniature pump's export is connected with the one end of pipeline, and the other end and the water bag of pipeline communicate, and the power is supplied power for miniature pump. When being in hot weather, the water bag is put into to cryogenic refrigerant to make the liquid cooling in the water bag, miniature pump goes into the pipeline with cryogenic liquid pump, and cryogenic liquids carries out the heat exchange at the mobile in -process of pipeline with the human body, reaches and falls the heat effect, when beingin the cold climate, put