When string vests are worn under clothes, they trap pockets of air and keep you warm.
Why are string vests no good by themselves ?
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Explanation:
The holes in the fabric channel out the sweat, while the remaining fibres trap warm air next to your skin. "Any clothing has got fibres in it, which keep you warm by trapping the air between them. On a string vest, the fibres are further apart, so it only works if you wear a shirt on top
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