I have tried several fishing-specific sun protection shirts that all 3 were hotter than the devil’s underpants. I was sweating like crazy in all of them.
The nylon material just does not breathe and those vent backs are worthless unless you do all your fishing in a 40 MPH wind.
Out of desperation I tried a Filson Feather Cloth shirt. Ahhhhhhh. Paradise found! Light as a feather, breathes like wearing nothing at all, durable, and complete freedom of movement.
I liked the Filson so much I now have 2 of them. Just got back from a prarie dog hunt last week, top temp was 104. Stayed comfortable, no sunburn.
I’m also a big believer in those blue cooling towels. Soak one in water, drape over back of neck. I hardly sweat at all with one of those on, they make it possible to work so much harder in hot weather it’s amazing.
Grouse