Wearable with temperature control

A device, comprising:

• a body-to-liquid heat exchanger, configured to exchange heat between a user's body and a liquid, the body-to-liquid heat exchanger comprising a conformal bladder defining a serpentine portion of a liquid-flow path, the bladder having a stress-relief aperture on an edge of the bladder and another aperture surrounded on all sides by the bladder and configured to receive a joint of the user;
• a first conduit placing an inlet to the liquid-flow path in fluid communication with an outlet of a liquid-to-ambient-air heat exchanger;
• a second conduit placing an outlet of the liquid-flow path in fluid communication with an inlet of the liquid-to-ambient-air heat exchanger;
• the liquid-to-ambient-air heat exchanger coupled to the first conduit and the second conduit, the liquid-to-ambient-air heat exchanger comprising:
• a pump in fluid communication with the liquid-flow path;
• a tank comprising another serpentine portion of the liquid-flow path;
• a Peltier thermoelectric cooler adjacent the tank and in thermal communication with the liquid-flow path;
• a heat sink adjacent the Peltier thermoelectric cooler, with the Peltier thermoelectric cooler being disposed between the tank and the heat sink;
• a fan configured to blow air onto fins of the heat sink;
• and
• a battery configured to provide electrical power to the Peltier thermoelectric cooler, the pump, and the fan;
• a valve positioned to release gas from a compressed-gas container responsive to a signal from a controller;
• and
• a channel into which the valve is positioned to direct the gas, the channel being configured to cause the gas to flow adjacent the heat sink to remove heat from the heat sink when the gas is released by the valve.