The 'jammer' suits have nothing to do with modesty or morality. As a long-time swim meet official, I have seen men's suit styles change with the times. 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. Also, as I've noted before, go to almost any US college swim meet during the competitive season from October-January - and you will see almost every guy in a brief suit. Only during the conference and national championship meets in February and March do most guys switch to the jammers
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