I'm used to the BDU caps I can find in military stores that have an inner layer and an outer layer to match the shape of the cap obtained inner layer is slightly smaller outer layer which creates 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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