Wore this on a full day of hiking in direct sun and never felt overheated — the UPF 50 actually held up. It's thin and dries fast after a sweaty climb, and the sleeves don't cling. Exactly what I wanted for summer trails.
The UPF 50 is what sold me since I burn easily, and it held up fine on a long afternoon outside. Only gripe is the fabric feels a little thin, but it dries fast after a sweaty hike so I'll take it.