White is Wool Blend, Navy is 100% Cotton Twill. Pro Style Caps with Large Diver design on the front with the most popular Navy SEALs saying "The Only Easy Day Was Yesterday" design embroidered on front. Navy is 6-panel, adjustable self-fabric strap with brass buckle/snap fastener and grommet, and constructed with a firm Front Panel. White one is 6-panel, seamed front panel with Buckram, pro stitch on crown, matching fabric undervisor and sweatband with adjustable snap. One size fits all.