I'm used to BDU hats that I can find at military stores that have an inner layer and an outer layer that help keep the hat's shape than inner layer is slightly smaller than outer layer, creating a rigid structure (does not round at the top fillet of the cylinder). Also, most military grade BDU hats are made from 50% poly, 50% cotton, and ripstop poly. These are single ply cotton. They should fit most people, but if you're looking for military-style BDU hats, keep looking.
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