What do people get wrong about smelly shoes?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
In Japan, where you take your shoes off indoors, smelly shoes are a worry that other people discover at the entrance hall (玄関, genkan). "Will deodorant spray solve it?" and "is it fine to wear the same shoes every day?" are asked abroad too. Knowing where the smell comes from changes the approach.
Causes and measures
| Cause | Mechanism | Measures |
|---|---|---|
| Moisture | Feet produce about 200 mL of sweat a day. Inside a shoe it reaches about 90% humidity and 35°C | After a day's wear, dry for 1–2 days; take out the insoles; drying agents, newspaper, wooden shoe trees |
| Bacteria | Break down skin oil and dead skin, releasing isovaleric acid, acetic acid and others | Fresh socks every day; wash between the toes and around the nails; care for hard skin (see the heel article) |
| Material | Synthetic leather and rubber breathe poorly and dry slowly | Breathable materials; rotation |
| Socks | Synthetics dry fast but hold odour; cotton absorbs but dries slowly | A moisture-wicking, quick-dry blend; five-toe socks (5本指ソックス); carry a spare pair |
| Washable shoes | Trainers etc. | Wash monthly and dry completely (see the trainers article) |
- Deodorant sprays and deodorisers are a back-up that breaks down or absorbs the odour molecules; unless you reduce the bacteria and the moisture, the smell is back the next day.
- Baking soda (重曹, jūsō), mildly alkaline, neutralises acidic isovaleric acid, so putting it in a cloth bag inside the shoe is a method shared among people living in Japan. Loose powder leaves a white residue.
- Putting a 10-yen coin (copper) in the shoe is folk practice based on copper's antibacterial property; its effect is generally described as limited. Newspaper, which draws out moisture for the time being, is more reliable.
- If the smell is strong and the skin peels or itches, it may be athlete's foot (足白癬, tinea pedis) — see a dermatology clinic (covered by Japanese health insurance).
[Verify] Sweat volume and in-shoe temperature and humidity are general figures. Check the odour compounds against Japanese Dermatological Association and textile-industry material.
Misunderstanding 1｜Deodorant spray solves it
It only holds the smell down for a while. Dry, wash, change socks comes first.
Misunderstanding 2｜Wearing the same shoes every day is fine
The inside of a shoe does not dry overnight. Rotating 2–3 pairs is the single most effective measure.
Misunderstanding 3｜Sun-drying the shoes kills the bacteria
Direct sun hardens leather and degrades synthetic leather. Shade with good airflow, insoles out. UV only kills what is on the surface.
Misunderstanding 4｜Washing your feet with soap is enough
Bacteria stay between the toes, around the nails and in the hard skin on the heels. Wash between the toes, dry completely, then put on socks. Keep nails short.
Misunderstanding 5｜Smell is down to your constitution, nothing to be done
It is a moisture-and-bacteria problem, and shoes, socks and how you wash change it a great deal. If it doesn't improve, or the skin peels or itches, see a dermatologist.
---
Sources
- Japanese Dermatological Association, "Dermatology Q&A: athlete's foot" [公益社団法人日本皮膚科学会「皮膚科Q&A 水虫」]
https://www.dermatol.or.jp/qa/qa16/index.html
- Japan Leather and Leather Goods Industries Association (JLIA), "Shoe care" [一般社団法人日本皮革産業連合会「靴のお手入れ」]
https://www.jlia.or.jp/
- Tokyo Metropolitan Bureau of Public Health and Medical Services, "Mould, bacteria and humidity" [東京都保健医療局「カビ・細菌と湿度」]
https://www.hokeniryo.metro.tokyo.lg.jp/kankyo/kankyo_eisei/jyuukankyo/indoor/kabi.html
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Follow the care label and the maker's instructions for any garment, shoe or bag. For expensive or sentimental items, ask a specialist cleaner or repairer.
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