e4Hats.com NASA Insignia Embroidered Cotton Twill Cap - Black OSFM 100% Cotton Made of 100% cotton. One size fits most with adjustable velcrorized strap closure, fitting up to XL. Same material inner hatband. Adult/Unisex. Crown measures 3 1/2 inches deep. You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!