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Originally Posted by Swimmboy
I spoke with a US college male swimmer a few years ago about why the jammers were so popular. He told me it was because the jammers wrap around the thighs and give support to a swimmer's large muscles in his upper legs. This support keeps his muscles from getting tired as quickly.
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Doesn't explain why female long distance runners wear very brief shorts.
Possibly jammers would be better for swimming in cold water, to keep your legs warmer?