Development and Use
The use of Jungle or Hot Weather boots predates World War II, when small units of U.S. soldiers in Panama were issued rubber-soled, canvas-upper boots for testing. Developed in conjunction with the U.S. Rubber Company, a pair of Jungle boots weighed approximately three pounds. Adopted in 1942, the design of the Jungle Boot was based on the idea that no boot could possibly keep out water and still provide sufficient ventilation to the feet in a jungle or swamp environment. Instead, the Jungle Boot was designed to permit water and perspiration to drain, drying the feet while preventing the entry of insects, mud, or sand.
In 1942, fused layers of original-specification Saran or PVDC were used to make woven mesh ventilating insoles for newly-developed jungle boots made of rubber and canvas. The Saran ventilating insoles trapped air which was circulated throughout the interior of the boot during the act of walking; moist interior air was exchanged for outside air via the boot's water drain eyelets. In cold weather, the trapped air in Saran insoles kept feet from freezing by insulating them from the frozen ground; when walking, the insoles circulated moist air that would otherwise condense and freeze, causing trench foot or frostbite.
The new M-1942 canvas-and-rubber Jungle boots with Saran mesh insoles an were tested by experimental Army units in jungle exercises in Panama, Venezuela, and other countries, where they were found to increase the flow of dry outside air to the insole and base of the foot, reducing blisters and tropical ulcers. The Saran ventilating mesh insole was also used in the M-1945 tropical combat boot.
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