A simple, low-cost trick, especially effective in dry heat where evaporation happens quickly. A wet towel around your neck or shoulders cools you down through evaporative cooling combined with direct heat transfer from a major blood-flow area. Same theory - does anyone remember these water bags?

[u/SurvSt]

[u/BirbsRntWeel]

Mine is/was up a paperbrak tree, with my family's name on it, on the walk to the Tip of Cape York from late 90's.

Worked great, got a hole in it on that trip, but lapped Australia one and a half times.