It’s a common experience for travelers – you take off your shoes after a long flight and a noxious foot odor hits your nose. Your feet seem fine before you board, but after sitting in cramped quarters breathing recycled air for hours, they suddenly reek. What causes this unpleasant post-flight foot smell? There are a few key reasons.
Lack of Circulation
When you’re sitting for extended periods on a plane, your feet and legs remain relatively static. This leads to reduced circulation to your lower extremities compared to if you were walking around. With less fresh blood and lymph fluid circulating down there to transport waste and moisture away, sweat and dead skin cells can build up. The dark, moist environment inside your shoes and socks then creates a prime breeding ground for odor-causing bacteria.
The closed-in cabin also causes many travelers’ feet to sweat more than usual during flights. The air conditioning frequently isn’t strong enough to provide cooling relief, and the pressurized environment can also promote perspiration. As sweat soaks into your shoes and socks, it makes the ideal conditions for microbes to multiply and produce smelly metabolic waste. This is exacerbated by common in-flight dehydration, which concentrates sweat compound levels.
There are over 100 species of bacteria known to live on human feet, feeding on your sweat, oils and dead skin. When you enclose them in shoes for hours, they enter a rapid growth phase. Bacteria called micrococci in particular digest sweat to create propionic acid, which gives foot odor its vinegary tang. Fungal groups like coryneform also thrive in the environment to generatefoot-smelling metabolic byproducts. The longer the flight, the more these microbial populations can expand.
Poor Air Circulation
Modern passenger jets recirculate 10-50 percent of cabin air to increase fuel efficiency. This air passes through filters, but some odor molecules may persist and accumulate. The higher CO2 levels measured on planes can also indirectly enhance foot bacteria growth. So smelling everyone’s foot bacteria excretions likely adds an ambient element to your own shoes’ stink. Breathing at a low cabin humidity level additionally makes olfactory glands in the nose extra sensitive to scents.
What shoes you wear impacts post-flight odor potency. Odor molecules get trapped in shoes made of nonbreathable materials like rubber, leather and plastic. Canvas or mesh shoes allow more ventilation and evaporation of sweat, keeping feet drier. Wearing sock liners under your normal socks can also help wick more moisture away from your feet during long stretches of immobility.
Preventing that embarrassing post-flight foot stink takes some planning. Here are some tips:
- Bring extra socks and replace mid-flight
- Use moisture-wicking sock liners under regular socks
- Apply antibacterial/antifungal foot powder pre-flight
- Choose breathable shoes for air travel
- Stay hydrated in-flight to avoid concentrated sweat
- Move lower legs and ankles periodically when seated
- Remove shoes occasionally for ventilation if possible
A cross-country or international flight inevitably means being subjected to some odd foot smells when everyone starts removing their shoes. But taking proactive steps can help minimize your own post-flight foot odor. Give your feet relief from confined shoes whenever you can, change damp socks, and perhaps even hose off your feet before sliding them back into your shoes. Follow this advice for fresher-smelling feet after plane trips.