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 You have probably noticed that the synthetic¹ shirts stinks² more after a workout, compared to cotton. But hey, it's not the fabric's fault, it's the microscobes that hang out on synthetics³ that create the characteristic stach. That's according to a study in the journal Applied⁴ and Environmental Microbiology. Twenty six volunteers, half men, half women, worked out on spinning bikes for an hour and they did so outfitted⁵ with shirts of cotton, polyester or a cotton synthetic blent. Then the researchers stuffed the sweaty shirts into plastic bags. The next day, a trained panel sniffed⁶ them, rating their funk. Unlucky job , because,yes,  the polyester shirts indeed moremusty, sour and emonia-like than the cotton. DNA⁷ analysis revealed that micrococcus bacteria were to blame. They aren't that common in the armpit itself, and they don't flock to cotton. But researchers say they thrive on the open-air latus of synthetic fibers⁸ where they sit chopping on the long chain fatty accid in our sweat, turning them into shorter, stinkier molecules⁹.  This finding might just explain one of the most vexing¹⁰ questions of adolescents," Why do the stinky shirts smell so differently unpleasant from the body odor and armpits themselves?" Could be, because your favourite shirt has a microbio itself.