The WWII U.S. Army Boonie Hat (often called Jungle Hat or Bush Hat) originated in the Pacific Theater as lightweight headgear for troops operating in tropical climates such as Burma, New Guinea, and the Philippines. Made from tightly woven cotton herringbone twill (HBT) , the hat provided protection from sun and rain while offering ventilation and comfort in humid conditions.
The design featured a wide stitched brim, ventilation eyelets, and an adjustable chin strap, with early versions appearing in olive drab, khaki, or camouflage jungle green shades. While not officially standardized during WWII, these hats were theater-made or locally issued and became the foundation for the later postwar “Boonie Hat” widely adopted during Korea and Vietnam.
