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Polyester certainly isn't on a pedestal as a quality material, but most people don't think twice about wearing it. Buy the cozy sweater, the jammies, or the hat. No big deal, right? Polyester is everywhere, from underwear (most bras) and t-shirts to blankets, pajamas, socks, active & swimwear, and bedding. It's inexpensive, durable, and can be fluffy soft. But what if there's more to this ordinary fabric than meets the eye. Researchers investigating the effects of different textiles on their very favorite subject, dogs, uncovered some rather surprising findings.  Polyester and Males In a 1993 experimental study , researchers examined the effects of polyester underwear on sperm production in male dogs. Twenty-four dogs were divided into groups wearing either 100% polyester or cotton underwear, with additional dogs serving as controls. The dogs wore the underwear continuously for 24 months. Putting aside the adorable imagery, the results were striking. Dogs wearing po...