If an operative stepped onto a beach from a submarine or moved through a muddy jungle trail, their standard military bootprints would instantly alert Japanese coastal patrols to Allied activity.

To counter this, camouflage specialist Hugh Vandeleur designed rubber soles molded into the exact shape of bare human feet. When tied over conventional combat boots using integrated canvas tapes, the overshoes left tracks that perfectly mimicked local, barefoot residents. This misdirection successfully hid the presence of covert teams, such as those led by legendary operative F. Spencer Chapman. Beyond masking identity, some variants of these overshoes could also be adjusted or reversed to disguise the direction the agent was traveling.

They were cast from flexible, heavy-duty rubber to withstand maritime landings and suppress the crunching sounds of footsteps. Each mold was designed with fabric tying tapes that securely wrapped around the ankles and upper soles of an agent’s standard footwear.

While brilliantly creative in theory, the footprint overshoes suffered from serious practical limitations. Because they had to fit over large European military boots, the cast “bare feet” were often disproportionately massive compared to the actual footprints of the local populations they tried to mimic. Additionally, operatives found them bulky, clumsy, and difficult to balance in, comparing the awkward movement to walking in snowshoes.

Despite limited operational use due to their clunkiness, the concept proved highly influential. Decades later, during the Vietnam War, the U.S. Army’s elite MACV-SOG commandos revived the exact same concept, wearing specialized “bark soles” or barefoot-molded jungle boots to mask their movements along the Ho Chi Minh Trail.