The bandages are soaked in a liquid that came from a special kind of cactus that produces a substance that absorbs any form of heat including body heat. Except it evaporates extremely fast when it's expose to the elements, To prevent that from happening they just dip the bandages in it and wait for it to soak but wearing one can be itchy and irrating when wore too long but on a plus side it also has a rejuvenating effect on skin and hair. It has it's ups and downs effect but it's really effective in hot weather or areas that has the sun beaming down on it.

Spacetaker man's people discover this plant while trying to survive the heat waves in the deep desert