American Flag Store, Flags Unlimited offers a complete line of Valley Forge outdoor American flags for sale. We offer Valley Forge brand of outdoor American flags in durable Perma-Nyl Nylon, strong Koralex II Polyester 2, Duratex II Polyester and classic Best® Cotton materials, from a name you know and trust. Valley Forge, the "Greatest Name in Flags". All of our Valley Forge outdoor U.S. American flags are 100% made in the USA and are made to the highest quality standards. A complete selection of sizes is available for our outdoor USA flags, from 4"x6" up to 30'x60'.