... buyer's demand such as AZD-Free material,Canvas,Polyester,Acylic etc5. Back ClosureVelcroBrass,Plastic, ,Velcro,Metal ... snapback hat, baseball cap, winter hat ,camp cap, trucker hat, knitted hat, fashion hat ,army/military cap.Pre-sale serviceAdvise OEM ... analysis, production cycle, market test , risk control) Material advise.Polyester(cheap) – mainly for snapback hat , baseball capAcrylic(cheap) – ...