I'm really picky about ball caps, and wouldn't wear any of the ones posted so far. I like low profile stretchy hats without a hard knob on top. All hats need to be machine washable. Here are the hats I use:
Oakley SI Cap (my current favorite). I have a few of these.
Kryptec Tactical Hat. This one isn't stretchy, but is adjustable enough for me to put a fleece watch cap under it if it's cold. Really great hat.
Arcteryx Baller Ass Cap. Good hat, but sweat bleached the color out at the front so it looks nasty.
Just ordered this hat, but it hasn't arrived:
FirstSpear Forager hat
https://www.tacticaldistributors.com...ant=4691091585