1. Polyester causes infertility.
1. Polyester causes infertility.
A landmark medical study fitted men with polyester underwear and tracked them for two years. The results were unambiguous: reduced sperm count, degenerated testicular tissue, and complete infertility in some subjects.
Nero fix: The men who switched to 100% cotton recovered.
2. Microplastics are now found in human testicles.
2. Microplastics are now found in human testicles.
A 2024 University of New Mexico study found microplastics in 100% of human testicles tested. Every single sample. The most common polymer? Polyethylene. The second? Polyester.
Nero fix: Zero microplastics, lab tested cotton.
3. Tight underwear is the enemy.
3. Tight underwear is the enemy.
Testicles sit outside the body for one reason: they need to run 2-3°C cooler than core temperature to function. Polyester traps heat. Synthetic blends trap heat. Tight plastic-based underwear is a documented cause of suppressed testosterone and reduced sperm motility.
Nero fix: Comfort fit. Organic cotton breathes. It wicks. It cools. It's what your body was designed to wear.
4. Your skin is absorbing what your boxers are made of.
4. Your skin is absorbing what your boxers are made of.
The scrotum has the highest absorption rate of any skin on the male body, up to 11 times higher than the forearm. Whatever's pressed against it ends up in your bloodstream.
Nero fix: Zero synthetics, Natural OTEX certified dyes, zero plastic.
5. Buy 2, Get 2 Free — Ends When Stock Runs Out
5. Buy 2, Get 2 Free — Ends When Stock Runs Out
This is a limited production run. Once it's gone, the offer ends and the next batch ships in Q3.
Boxers for Any Season
Boxers for Any Season
100% GOTS Certified Cotton: The strictest textile certification on earth. No pesticides. No formaldehyde. No PFAS. No azo dyes. No heavy metals. Audited from seed to stitch.
Corozo nut buttons: The seed of the tagua palm. Hand-cut, hand-polished. What Savile Row used before plastic became cheap.
Built for Everyday: Crafted from unbelievably soft yet durable Cotton fibers, our boxers handle intense workouts, weekend hikes, and everything in between.