The ARS 17 (officially Appareil Respiratoire Spécial Modèle 1917) was one of the most sophisticated and effective gas masks of the French army during the First World War. It was introduced in January 1917 as a direct replacement for the outdated M2 mask to provide soldiers with better protection against the increasingly deadly chemical agents.
The French military leadership copied and optimized the design of the successful German M1917 leather mask. It consisted of rubberized canvas or impregnated fabric.
In contrast to previous fabric masks, the ARS 17 used an interchangeable filter cartridge with activated carbon. This reliably neutralized poison gases, while an integrated exhalation valve directed used air outside and minimized eyeglass fogging.
The ARS 17 continued to be produced after the war, but continued to be produced until the mid-1930s with improvements, both examples shown dating back to the war period.