We specialize in U.S. Flags. There are two types of large U.S. Flag materials - Polyester-2 and Nylon. Polyester-2 lasts the longest, but is more expensive and heavy to handle. Polyester-2 looks like cotton. Nylon is brighter in look and flies the best in light to moderate winds, but does not last as long as Polyester-2. Have a question? Call (208) 713-5000 or email CustomerService@ApexFlags.com. Thank you, we truly appreciate your business.