Armycrew Oversize Structured Flex Fitted Mesh Back Flexfit Baseball Cap. 55% Polyester, 43% Cotton, 2% PU Spandex. Cap is made to comfortably fit those with big head sizes. High quality original FLEXFIT brand cap. Structured, 2 Front panel with mesh back, Grey color undervisor. Closed end, Stretch fitted cap. One Size Fits Most Big Head Sizes, fitting up to XXL.