The basis for a stillsuit...
Gravity Pumped AC Boots
The human body is cooled in two ways: the evaporation of sweat and heat transfer from where large volumes of blood pass close to the surface (e.g., neck, hands, feet).
As you walk you compress the working fluid and move air passed the heat rejection chamber. The cooling fluid is circulated around your feet, keeping you cooler as you walk.
Fake. But I like the idea.