Carharttmens Dunmore Mesh Back Cap Canvas Mesh-back Logo Graphic Cap (pack of 1)

Please Is the mesh back 100% cotton as well or not??

I have a tall head will it fit low on my head or will be way up on my head?

What does OFA mean for size?

I sweat like a pig in a sauna and do physical labor all summer long. Is this hat as good as a regular sweatband?