The useful choice here is simple: this shirt is only offered in a kids fit, with sizes from 2T through X-Large. It’s Poncho’s Bluegill Long Sleeve in the same fabric they use for The Original, just cut smaller.
Poncho describes it as lightweight, breathable, and quick-drying. That points to a long-sleeve that’s easy to wear when it’s warm and you want something that dries out fast.
If you’re looking for adult sizing, this one won’t cover it.