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In 1992, scientists used polyester to make men temporarily infertile. On purpose. To be clear: we are NOT saying your boxers are birth control. Their infertility reversed once they stopped the study. That was an extreme setup. But it says something about conventional underwear, most of which happens to be made from mostly polyester. Which is plastic. Usually finished with toxic dyes and chemicals nobody lists on the tag. NADS is the cleaner option: GOTS-certified organic cotton, no plastic at ball contact. A variable worth considering. nadsunder.com