Liquid cooling and ventilation garment
A liquid cooling garment (LCG) is a form-fitting garment that is used to remove body heat from the wearer. It is commonly used in environments where evaporative cooling from sweating and open-air convection cooling does not work or is insufficient, or when the wearer has a biological problem that hinders self-regulation of body temperature.
Source: Wikipedia — Liquid cooling and ventilation garment (CC BY-SA 4.0)