Look for nylon-spandex blends with a UPF 50+ tag.

That’s it. The fabric blend does the drying, and the UPF rating is tested, not guessed. Nylon-spandex (or polyester-spandex) dries fast because it’s hydrophobic — water slides off instead of soaking in. Cotton or cotton blends stay wet and heavy; avoid those.

UPF 50+ means it blocks 98% of UV rays. Any reputable brand will have a tag or label stating the rating. If it doesn’t say UPF, it’s just a shirt. You don’t need to spend $80 — brands like O’Neill, Speedo, and Baleaf all make solid ones for $30-50.

Fit matters, too. A loose rash guard lets water and sun sneak in. A snug (not tight) fit stays in place during paddling or diving and dries faster because less air traps moisture.

You’re overthinking it. Nylon-spandex + UPF label = done.