At the World Championships, most males will be wearing jammers for their races because they are, or are believed to be, faster. The fabric is slicker than human skin, so the more of your skin that is covered, the slicker you are. And the compression of the thighs helps prevent your thigh muscles from getting so tired (this was told to me by a U.S. college swimmer). Even brief-loving Ryan Lochte says he will wear jammers for races. Briefs are gone from major competitions - that's just the way it is. However, if you attend almost any US college meet in your area, most guys will be wearing briefs - for the most part, they only wear jammers during end-of-season conference or national (NCAA) championship meets.
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