When I was working in the shop and the heat index was at least 130 degrees in metal assembly, I was throwing Trans Am/Camaro rear frame rails all day, and we got a break a couple of times over the years. Our committee man and another person came down on a scooter with a big jug of Kool-Aid, from the cafeteria I think, and we each got a little cupful before slinging steel the rest of the day. Picking them up, tossing them in weld fixtures, and hitting a button to cycle the welder, over and over again. We got a break because our union local got it for us, not because GM wanted to give it to us, and not because the government would take care of us either.
I have a very low heat tolerance and I'm still alive. Being outdoors in 90 degree heat with some breeze would have felt like sitting in front of a fan in comparison. As Heath Franklin in his impression of Chopper Read said, "Harden The F**k Up!"