Disclosed is a thermoregulation system, including an output port (54), an input port (62), a thermoregulation fluid supply system, an output pump (52) for pumping thermoregulation fluid out through the output port, an input pump (64) for pumping thermoregulation fluid in through the input port, and a pressure control system. The pressure control system is for selectively operating a pressurising element of a personal thermoregulation pack to apply a pressure independently of operation of the input (64) and output (52) pumps.