lol we call ours a "do rag" but it's really just a bandanna quartered and tied over the noodle.
some guys wear them cuz they really are bald, others like me go for the comfort.
back in the days when I used to sweat out a bunch of alcohol it kept it out of my eyes too. It's a pain having to wipe your eyes and forehead constantly when you are working in dirty/dusty places.
You can get fancy and buy special ones but I burn through them so much that I just go to my tie dye girl and get 'em for cheap. She uses all cotton fabric and I have a problem with poly so It's always been my go to....