First, for sizing info, I am 5ft1, 106lbs and I got the XS. It's fits perfectly for my taste; loose but not extremely baggy. I got the Arctic Blue and the Columbia Blue (pictured).

As for performance, I am overall very happy with these shirts. I believe they are as light and as breathable as a full a sun-protecting long sleeve shirt can be. In particular, I have ran in them during 85F degree weather and they did the job for me. I may have heated up a little bit more than if I were just wearing a sports bra, say, but they still felt breathable and, especially for longer runs, the sun-protection kept me cooler by the end of my run.

The only slight con I could think of is that they are not very odour-resistant, but I think that is to be expected from such materials. Definitely not a deal-breaker for me.

For golf and tennis

I love this shirt!

I really like these shirts. Perfect for working outside in the garden or mowing the lawn, hiking and having good sun protection too. It’s crazy hot where I live in the summer and these shirts wick sweat when working outside. I am 5’8” so the medium is the best fit, small was just too tight. They are a little sheer but not so sheer that you need an under shirt. I’ve bought two already.

I ordered another brand in white color which I expected would be cooler, but this one in the blue was cooler and not as thick. I had ordered from a few brand to see which one I liked best. It is this brand, now I will order more colors.