William E.wrote a review of Assos SkinFoil LS Summer Base Layer - Men's on June 12, 2019
Familiarity: I've used it several times
Fit: True to size
To begin: I'm 6'0" and right at 200 pounds and wear a L-XL II in this Assos shirt. I also ride in South Florida, so the conditions are pretty extreme.
I wear the long sleeve version, and for me I feel noticeably cooler when I wear it. When I open my jersey a little, it makes an even bigger difference (I've since this purchase bought an Assos Millie jersey that I also love).
The sleeves are a little long, but because they're so tight you don't notice it. This is probably a function of me being a larger rider relative to my height.
Cool shirts and undershirts are a tricky thing. Your mileage may vary, and you might not like the idea of wearing the shirt under your jersey. For me, riding in 80-90 degree temps every day, I love it. I've actually bought a second one so I don't have to wash them every day and I can rotate them.