Humidity?
The problem at Desert temps is not the air temp as much as the radiation from EVERYWHERE (not just from that big yellow nuclear fusion device above). Exposed skin burns.
Here at the moment it is impossible to walk on tarmac/pavement/Stone in the middle of the day without shoes - the surface temps are way above 50°c.
Yesterday was especially "hot" and you could feel the heat on the sides of your ankles.
Last year I had light burns after an hour ride home on the outside of my ankles because my socks were rolled down.
Infra Red (heat) will easily pass through thin trousers.
At 37°C the air is warmer than body core temp. Any radiation will quickly heat you up. And dry you out.
A plus I have discovered - is PinLock visors. These seem to keep your face cooler in strong sun, and if you invest in the photo-chromatic insert MUCH moreso.
They do NOT go DARK it's more a light smoke.
Where I am still undecided is whether a well vented helmet is a plus or not. Comfort wise - yes obviously. But I wonder if it may not be better to be in a closed insulated environment.
