Why sweat itself does not smell
Short answer: Sweat from the ordinary glands is almost pure water with salt. Only when bacteria convert the few organic substances in the sweat does a smell appear. That is why fresh sweat hardly smells, while old sweat does.
Two kinds of sweat glands
Most glands release a thin, salty liquid with no smell, which the body uses to cool down. A smaller group in the armpits and groin releases a fatty liquid that bacteria can live on. That difference explains why the smell sits in the same few places on the body.
The bacteria make the odour compounds
Fatty acids and proteins are broken down into small molecules, and some of them smell strongly even in small amounts. That is why a very small amount of bacteria can cause a clear smell. See all bamboo socks for men if you want the whole range of socks.
Why fresh sweat does not smell
Right after exercise the sweat hardly smells. After an hour in a closed room it does. This is because the bacteria need time to process the sweat, and the odour compounds build up gradually. As soon as the clothing is dry again, the process stops. See Nordic Weaving and bamboo socks for men.
Feet are a special case
The feet have many sweat glands, and they sit in shoes most of the day, where moisture has trouble escaping. That gives the bacteria good conditions. Change socks if they get damp, and let shoes dry between uses, so the same moisture does not stay until the next day.
A lot of sweat is not a lot of smell
You can sweat a lot without smelling if the sweat comes from the ordinary glands and the clothing dries quickly. Conversely, a little sweat can smell if it stays in the fabric for many hours. Time and moisture decide, not only the amount, and that is a good reason to change clothes after a long day.
The smell returns after a shower
You can wash the smell off the skin, but the bacterial flora builds up again within a few hours. That is not a sign that you are doing something wrong. The body always has bacteria, and the aim is not to remove them but to keep them from finding moisture and food in your clothing for long.
Deodorant works on the skin
Deodorant and antiperspirant are applied to the skin and act on the local bacterial flora or the amount of sweat. They do not act on the bacteria in the fabric. So clothing can still smell despite deodorant if it has been damp for long. Washing is the fix that works on the fabric.
Drying makes the difference
Sweat only starts to smell once it is allowed to stay. Clothing that dries quickly between uses gives the bacteria fewer hours to work. Hang worn clothing to dry rather than putting it in a basket, and let it get air before you put it away. It costs nothing and helps more than you might think.
How to limit odour in daily life
Change into dry clothing after exercise, hang worn clothing to dry and wash it before the smell settles. Rotate your socks, so each pair can dry for a full day. If you are unsure what works for you, try one step at a time.
Frequently asked questions
Why do feet smell different from armpits
Because the bacterial flora and the gland type differ in the two places. The feet have many ordinary sweat glands and are often shut in shoes, while the armpits have more of the fatty glands.
Can you wash the smell off the skin
Yes, but the flora builds up again within a few hours. That is completely normal, and not a sign that you have washed too poorly or too rarely.
Does deodorant help on the clothing
No. It works on the skin, not on the bacteria in the fabric. The clothing still has to be washed and dried fully if the smell has settled in, whether or not you used deodorant.
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