The flag of Spain as it is defined in the Spanish Constitution of 1978, consists of three horizontal stripes: red, yellow, and red, the yellow stripe being twice the size of each red stripe. Traditionally, the middle stripe was defined by the more archaic term of gualda, and hence the popular name la Rojigualda (red-weld). The origin of the current flag of Spain is the naval ensign of 1785. The flag is best used indoors but can withstand occasional outdoor use. The authentic design is based on information from official sources. Screen-printed on a durable 150 denier shiny polyester material and finished with a double stitched hem, this flag features a white fabric header with two brass grommets on the 3′ side for easy display.