Hook and loop size adjustment... Structured firm front panel with contrasting color visor edge and underbill. This Otto Pro Style cap features 100 percent cotton, 6 panel construction. Structured firm front panel with contrasting color visor edge and underbill. This Otto Pro Style cap features 100 percent otto cap brushed cotton twill flip edge visor low profile pro style cap royal/white cotton front, 100 percent polyester pro mesh back, and 6 panel construction.