In any case, a friend talked me into trying out her Kastel shirt which led me to order FOUR sun shirts. In my defense, I only kept three of them. So here's the run down in reverse order, least liked to favorite.
SunShield Longsleeve Shirt by SmartPak
EIS Cool Shirt
Ariat® Polka Dot Sunstopper Shirt
Kastel Charlotte Signature UV Top/Shirt
When I wear the sun shirts, I can't feel the flies, and I feel shaded from the heat that bounces off the sand. All three shirts have vents from the arm pit to the cuff. This allows a decent amount of air to come through the shirt which helps me dry off a bit.
If I stand in the shade and there is any kind of breeze, the shirts definitely feel as though they are lowering my body temperature. I am not sure how it works, but it is a lovely feeling.
I ordered all three shirts in a large even though I tend to wear a medium. If these were winter-wear shirts, a medium would be fine, but the thought of having my shirt be that close to me in the summer made me sweat just to think about it. And even though the shirts are a large, the fit was actually fine. They don't look baggy or sloppy, so if you normally fill up a medium, you might want to go up a size.
I probably won't buy another EIS shirt, but I am going to be keeping my eye out for sales on the Kastel and Ariat shirts. Those two shirts are definitely keepers.