[pbhjpbhj]

Surely if the evaporation can cool the skin surface, then a local insulation layer would prevent ambient air from heating the skin. Just as a locally warmed layer prevents ambient air from cooling the skin during Winter.

It's certainly a hypothesis I've long held but never had chance to test.

Citations for support/contradiction welcome, thanks.

[caymanjim]

Unless it's above body temperature, the local ambient air isn't heating your skin up, and if it's that hot you need to sweat profusely to avoid hyperthermia.