I am extremely fair and will sunburn in 15 minutes. I live where it’s very hot in the summer, but our humidity is low. So not sure if varying levels of humidity affect how each shirt works? Anyway, I too have an entire “herd” of these shirts.
My favorites, in order, although the first 3 are pretty close:
> Columbia Omni-Freeze ice - with a collar, part zip. Has meshy panels on the sides of the torso and one down the middle of your back. seems to fit pretty true to size. Probably my favorite except I couldn’t find it on sale in a good color. Bought on sale for about $40.
> Ex Officio - “sun sol” fabric. Love it!! Super silky, super light fabric, no mesh panels. Mine does not have a collar (so I can’t show in it) , not sure if you can get one with a collar or not. Runs a little large. Bought on sale for about $40.
> Marmot - don’t know if they have a special name for it, but it is the special sun fabric. LOVE the color and feel and fit. Has no collar, don’t know if they make one. Has mesh panels on the sides of the torso and most of the back. The mesh get pulls easily
But otherwise the thing holds up super well. Even though it is white I don’t worry about having to wear another shirt underneath. Fabric is slightly heavier than the other 2 above. Runs true to size. Bought on sale for about $40.
> Bette & Court - beautiful quality, looks more “equestrian” than the other 3, and most suitable for showing. With a collar, part zip, and mesh on the bottom parts of the sleeves. Very light fabric with a texture to it. Runs large. Seems really similar to the EIS (which costs about the same), which I do not own but tried on, which runs small. More than twice as expensive as the other shirts, and not totally convinced it was really worth the money.
> REI brand sun shirt. Just not my favorite, not necessarily anything wrong with it, just don’t like it as much as the others. Pretty true to size. Bought on sale for (I think) less than $40.
> ROMPH sun shirt. Great because it is show quality. Has collar, mesh on bottom part of sleeves. Because it’s a horsey brand, it has a thing for a stock tie on the back of the collar. I don’t like that since I do jumpers, but other folks might count that as a definite plus. Heavy fabric, so it doesn’t seem quite as cool as the others, but I still like it. Even though I have white, the heavy fabric is easily thick enough I don’t have to worry about anything showing through. Runs a little on the large side. I think I paid around $55 or $60 on sale.
I passed on an opportunity to buy one of the Ariat shirts because I was told that the fabric has a coating which provides the UV protection, and as with any coating it will eventually wear off. I think all my shirts are the kind that the fabric itself blocks the sun – the only one I’m not real sure about is the ROMPH.