The South Dakota flag features the state seal surrounded by a blazing sun in a field of sky blue. "South Dakota, The Mount Rushmore State" is arranged in a circle around the sun. The seal depicts South Dakota's natural resources as well as its agricultural and industrial assets. Above these representations, a banner contains the state motto "Under God the People Rule". Along the outer circle or the seal are the words "State of South Dakota" and "Great Seal" with "1889", the year South Dakota became a state, on a banner separating the two words. Surrounding the sunrays are the words "South Dakota" "The Mount Rushmore State".
South Dakota 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.