ZINC OXIDE BLOCKS UVA UVB INFARED
Example: I have a propane radiant heater (propane 40 pound contained with heater screwed on top.
7 feet away my bare skin feels the heat from INFARED radiation. No hot air, just the INFARED waves. Bad for us.
The SUN emits all three. A fire emits INFARED.
Therefore the ZINC OXIDE protects the GROVERS from all three.
Most sun screens people uise normally DO NOT block the heat.
See: https://www.warrentondermatology.com/blog/infrared-rays-what-your-sunscreen-may-be-missing.

More: Heat Stuff:
I'm buying an all cotton mattress.
Those "memory foams" are murder on us guys. My back temperature is is 95F as I sit here typing, and I can tell that it wants to itch. . The memory foam puts it up a lot.

The following will cool my back;
I am working on a sleeping invention for us guys. Going to use air mattress as mattress top.
Pin holes in the air mattress at my trunk area only will leak little jets air at room temperature. A tiny low pressure compressor will run the air through a tiny "radiator" to cool it. You can put on the AC cold air output. This is getting better as I write. I do my best invention designs, when I explain them to people. A plus is ..... You can take it when you travel and use it on top of hotel bed. Whoa! Freedom!

I Love doing this stuff. Been an engineer (software, computer circuits) as a consultant for 35 years. Now retired 8 years and have a workshop with Lathe, Brake, Band Saw, Welders: Gas, Stick, Mig, and others. Dozens of AIR tools, hand tools. It would take days to move my shop to another property. So I gotta stay here. Started early (12 years old - build a gocart with lawnmower motor. At 16 put a 331 Chrysler Hemi in a 50 Ford.
So if you folks want chat about things other than Grovers, that would be fun.