The Wyoming state flag was adopted on January 31, 1917. The flag was designed by Mrs. A.C. Keyes (formerly Miss Verna Keys). The heart of the flag is the Great Seal of Wyoming which is located on the bison which helps to represent the custom of branding. The bison is honored for the significant role they played in the plains. The red and blue of the flag are the same colors as in the United States flag. The red border symbolizes the Indians and the blood of the pioneers who died reclaiming the soil. Purity and uprightness over Wyoming is represented by the white border. Fidelity, justice and virility are symbolized by the blue which is the color of the sky and mountains.
Wyoming flags for outdoor use are constructed of a durable nylon fabric especially developed for flag use. Nylon's tight weave provides maximum beauty and flyability as well as brilliant, fast colors. Its weave helps shed pollution, dirt and grime that the looser weave alternatives absorb. Nylon is water repellent and mildew resistant.