It is not the desert heat or the blazing sun. For that I wear long sleeves and a hat. (Note to eap: and sunscreen!)
It is not the thorns. For those I wear long pants.
It is not the incessant wind. That actually cools it down a bit.
It is the flies.
More specifically it is one bee-fly (I cannot tell which as it does not stop long enough for me to get a positive id).
The world's loudest bee-fly.
Take the regular buzzing of a fly, and then multiply it by one hundred.
And then send it swirling around your head and legs all. day. long.
Frantically swirling and bouncing off your hat, and pulling Top Gun stunts in front of your face.