Why not just heat and cool our bodies instead?
Wristify, as [a team of students at MIT] call their device, is a thermoelectric bracelet that regulates the temperature of the person wearing it by subjecting their skin to alternating pulses of hot or cold, depending on what’s needed.
[Sam Shames, one of the MIT seniors who developed the device said,] “The human body and human skin is not like a thermometer. If I put something cold directly on your body at a constant temperature, the body acclimates and no longer perceives it as cold.”
By continually introducing that sudden jolt of cold, Shames discovered, you could essentially trick the body into feeling cold. Wristify basically makes you feel like you’re continually jumping into the lake – or submerging into a hot bath.