David R Johnson
Registered
Question: What is the difference in a compression/workout long sleeve shirt and a rash guard (other than price)? Both should offer UV protection, both hold very little water (dry quick).
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Polyester is naturally UPF where nylon needs something added to it. UPF also depends on the weave of the garment.I've been comparing the materials used. It seems like surf/dive/water sports UPF 50+ skins are a makeup of nylon, spandex, and the compression shirts are polyester.
One of the main differences is the stitching seams. Flatlock stitching, placed in a particular pattern, minimizes the chances of chafing. Hence the name "rash guard". A standard athletic shirt may or may not have that kind of design.