It gets hot in Western Australia, sometimes 46 degrees Celsius combine that with clear skys, low humidity and 20 knot winds and the results can lead straight to the burns unit in the hospital.
I always wear a hat and in extremis I put sunscreen on my nose only. A lot of crew here wear an Arafat Hat or Urban Turban. On my list is to try out one of these and/or a buff. I reckon the buff gives better visibility.
So, at the moment hat and sunscreen but next step is to use a buff.