How do you I choose a good UPF article of clothing?

Composition of yarn (cotton t-shirts only have a UPF of 8, where polyester or shiny silks are usually higher)
Tightness of weave (tighter is better)
Color (darker and bright colors usually absorb better, but might be hotter during summer)
Stretch/tightness of fit (more stretch lowers the UPF)
Moisture (most fabrics lose UPF when wet… and that includes sweating)
Condition – worn fabrics will likely lose UPF
Finishing – if the fabric is coated with a UPF material, that may wear off over time
The beauty of sun protective clothing is that it works… until you take it off. This is me….in my hat and UPF rashguard at the beach.