How odour develops in clothing
Short answer: Sweat is almost odourless. The smell appears when bacteria on the skin and in the fabric break down sweat and skin oil into smaller molecules, and that takes hours, not minutes. That is why clothes rarely smell right after you put them on.
Three things must be present
Moisture, food and bacteria are needed for odour to appear. Remove one of them and the process stops, which is why dry clothing does not smell. The moisture comes from sweat, the food from skin oil and dead skin cells, and the bacteria from the skin itself. Knowing the three, you can choose where to step in.
The bacteria come from the skin
The skin has a natural bacterial flora, and part of it ends up in the fabric when clothing lies against the body. There the bacteria keep working as long as moisture is present. That is completely normal and no sign of poor hygiene. See all bamboo socks for women for the whole range.
This is why the smell comes later
Clothing that smells in the evening was odourless in the morning. Time is part of the recipe, because the bacteria must first turn the sweat into odour compounds, and that happens gradually through the day. On a long day you may notice a difference if you change clothes midday. See Nordic Weaving and bamboo socks for women.
Why some places smell more
Armpits, feet and groin usually smell first, because many sweat glands sit there and little air gets in. Clothing at these spots holds on to moisture, and the bacteria find better conditions. Shoes and tight clothing add to this, because moisture cannot escape, and this is often where a smell is noticed first.
The material plays a part
Some fabrics hold on to moisture and oil longer than others. Synthetic fibres leave sweat on the surface, while cellulose fibres such as cotton and viscose take part of the moisture into the fibre. That does not change the fact that worn clothing must be washed in the end, but it can affect how fast the smell arrives.
Airing helps, but only a little
If you hang clothing to air, the moisture disappears and the bacteria stop working. That delays the smell, but it removes neither the food nor the bacteria still in the fabric. So the clothing can smell again as soon as it gets damp. Airing is a good pause between washes, not a replacement after heavy sweating.
Washing and drying
A wash removes food and bacteria, and drying afterwards removes the moisture. Follow the care label and let clothing dry fully before you put it in the wardrobe. If you fold damp clothing or leave it in the basket for days, the bacteria have time to carry on and the smell can settle in the fabric.
How to keep clothing fresh longer
Change into dry clothing after sweating, and let shoes and socks dry between uses. Rotate between several pairs, so each pair gets a full day to dry. Wash clothing before the smell settles in, and use no more detergent than needed, since soap residue can stay in the fabric.
When the smell does not go away
If the smell stays in the fabric after washing, there may be residues of oil or soap in it. Try an extra wash at the temperature the label allows, and let the clothing dry fully afterwards. If a smell on your body is a new and sudden change, talk to your doctor or a pharmacy.
Frequently asked questions
Why do some people smell more
Because the mix of sweat and skin flora varies from person to person. It depends among other things on how much you sweat and which bacteria live on your skin.
Does it help to air the garment
Yes. Without moisture the bacteria stop working and the smell does not develop further. But food and bacteria are still in the fabric, so the garment still has to be washed.
Can you remove the smell without washing
Partly by airing, but only a wash removes the food and the bacteria. Hang the clothing until it is completely dry, and wash it when you get the chance.
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