1. It’s Plastic Bottles
Polyester is basically melted-down plastic bottles spun into fabric. During a workout, your body temperature rises and your pores can open up to 30% more, making it easier for tiny bits of microplastics and chemical residues to leach directly into your skin and bloodstream.
2. Shrinks Your Balls
A landmark study asked men to wear a polyester scrotal sling for 12 months. The result? They all became infertile around 140 days in, and their testicular size dropped significantly. Only after stopping the polyester contact for 75–135 days did their testicles return to normal size and sperm levels bounce back.
3. It’s Cheap and Overused
A 2022 market analysis found that 92% of gym wear is made from polyester—why? Because it’s the cheapest, fastest fabric for brands to mass-produce. They’re cutting corners to boost profits, ignoring how plastic-based shorts can harm your health and comfort. Bottom line: you’re sweating in recycled bottles while they rake in profit.
4. Fuels Rashes & Odor
Polyester literally locks in sweat and bacteria, creating the perfect breeding ground for skin irritation and a funk that’s nearly impossible to wash out.
5. Pumps Microplastics into Your Body
Think of it this way: when you sweat, your pores open up, like little doors on your skin. Polyester shorts shed tiny plastic pieces (microplastics) that can slip right in. In 2022, scientists found microplastics in 80% of people’s blood.
6. Test them out for 99 days
Ready to experience the Merino Wool difference? We’re so confident you’ll love our Nero gym shorts that we offer a 99-Day Money-Back Guarantee—no questions asked. If you don’t feel the comfort, breathability, and odor-fighting power everyone’s raving about, just send them back for a full refund. Seriously, what have you got to lose (besides those sweaty plastic shorts)?
Shorts for Any Season
- Temperature-Regulating: Stay cool in scorching heat and warm when it’s chilly—no more sweaty plastic clinging to your thighs.
- Naturally Moisture-Wicking: Merino wool quickly absorbs and evaporates sweat, keeping you dry and comfortable throughout the day
- Built for Every Workout: Crafted from unbelievably soft yet durable Merino fibers, our shorts handle intense workouts, weekend hikes, and everything in between.
Nero Merino Liner Short
All-natural athletic shorts designed for movement and built for durability.
All Natural Fabrics
Regulates Temperature
Moisture-Wicking
Soft As Cashmere
New Zealand Merino
“I wish I'd tried them sooner”
99 day money-back guarantee
Don’t absolutely love your Nero Shorts? No Worries - we uphold a 99-Day Money-Back Guaranteed policy. No questions asked.
New zealand merino
Our Merino Wool is sourced and produced in NZ and production is finished locally.
Fast and free shipping
Get free shipping and 3-4 day delivery