Very comfortable. They are quite thin but not transparent. They stretch a bit which is surprising because when you touch them it feels like the material of a parachute and it doesn't look like they're stretching but they do. I really like her. I can't vouch for the UPF function because I wear them indoors to the gym and they are great for that, but I bought them without caring about the UPF function. But they are comfortable and cool.
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