The Montana state flag contains the state seal centered on a deep blue background. The seal, with a gold border, depicts a plow, shovel and pick on a green bank with the Great Falls of the Missouri River in the background. A beige ribbon contains the state motto - "Oro y Plata" - in Spanish "Gold and Silver". The seal depicts mountains and a sunny sky. The state legislature adopted the flag in 1904, although Montana volunteers had carried it in the Philippines during the Spanish-American War in 1898 and was considered the state flag for many years prior to its adoption. The word "Montana" above the seal was added in 1981, and in 1985 another modification specified the font for the word "Montana".
Montana 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.