Contains Endocrine-Disrupting Chemicals

Polyester may leach phthalates, BPA, or antimony, particularly when exposed to heat. These are endocrine-disrupting chemicals that can interfere with hormones — not something you want near your junk.

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Polyester as a Contraceptive

Dr. Ahmed Shafik’s study found that wearing polyester underwear reduced sperm production and caused testicular damage in rats, sometimes leading to azoospermia. He suggested the fabric’s electrostatic effects might impair fertility, raising concerns about polyester's role in male reproductive health.

Linked to Lower Testosterone Production

Studies suggest microplastics and their chemical additives can suppress testosterone by disrupting testicular cell function and hormone signaling — potentially impacting energy, libido, and fertility over time.

Releases Microplastics When You Sweat

During intense workouts, heat and friction can cause polyester to shed microplastics and leach chemicals into your skin — exposing your body to toxins right when your pores are most open.

Save Your Sack with Gotchies Organic Cotton

Made with GOTS Certified organic cotton, underwear that’s finally designed to work for you, not against you. With our catalog of boxer briefs and boxers, we’re sure you’ll love these sack savers. Try them risk-free for 30 days.