Polyester underwear isn’t just a fabric choice — it changes the biology of the body wearing it. Male fertility is extremely sensitive to heat, airflow, and chemical exposure. Polyester is a plastic. It traps heat, blocks ventilation, and creates a warmer micro-environment around the testes — which matters because sperm production requires temperatures lower than core body temperature. Even small, sustained increases can reduce sperm count, motility, and quality. But heat isn’t the only issue. Po
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Polyester underwear isn’t just a fabric choice — it changes the biology of the body wearing it. Male fertility is extremely sensitive to heat, airflow, and chemical exposure. Polyester is a plastic. It traps heat, blocks ventilation, and creates a warmer micro-environment around the testes — which matters because sperm production requires temperatures lower than core body temperature. Even small, sustained increases can reduce sperm count, motility, and quality. But heat isn’t the only issue. Po
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