Your gym shirt is made of plastic. This one isn't.
Five reasons athletes who care about what touches their skin are making the switch to merino wool.
"So comfy. It was perfect for my Pilates class. And no smell :)"
Polyester Is Made Of Plastic
Polyester is petroleum-based plastic. It dominates activewear because it can take a beating and is cheap to produce at scale, But ultimately, wearing the typical performance tee is like wrapping yourself in cellophane.
Every time you sweat in polyester, your pores open and can absorb microplastics shed from the fabric. We've accepted it as the default and the $200B activewear industry has no incentive to talk about it.
Merino Regulates Temperature. Polyester Just Traps Heat.
Polyester wicks moisture by spreading sweat across the fabric surface, resulting in a clammy, sticky feeling that clings to skin.
Merino wool fibers actively respond to humidity and temperature changes. They absorb moisture vapor before you even feel wet, and release heat when conditions shift, resulting in all-day comfort. The best part is this is an inherent property of the fiber itself, not some chemical treatment.
Feel the Difference Natural Makes
100% merino wool. No synthetic fabrics. Free shipping over $100 plus 15% off with code "hellowool".
Polyester is a Breeding Ground for Odors. And Bacteria.
Gym clothes smell. It's just what they do. But it's not your fault – it's bacteria thriving on polyester. Synthetic fibers create the perfect environment for odor-causing bacteria – another thing we've all accepted as the default.
Merino wool's natural lanolin and fiber structure resist bacterial growth at a microscopic level, naturally. Wear an Aiua shirt for two, three, four days — then try that with your polyester.
Merino Feels Luxuriously Soft
When most people hear "wool," they think of a scratchy holiday sweater. Merino is different. At 18.5 microns, our fibers are three times finer than a human hair, making for a luxuriously soft feel.
The result is a fabric that feels like a high-end cotton tee, with the inherent performance of merino fibers: temperature-regulating, odor-resistant, moisture-managing, and completely natural. Great for sensitive skin.
Merino Biodegrades. Polyester Pollutes.
A polyester shirt takes 200+ years to decompose in a landfill. Every wash of synthetic clothes sends hundreds of thousands of plastic microfibers into waterways.
Merino wool is a renewable fiber that biodegrades naturally. When an Aiua garment reaches end of life, it can return to the earth. Future generations will thank you.
How Aiua Stacks Up
| Typical Activewear | Aiua | |
|---|---|---|
| Material | Polyester (plastic) | 100% Merino Wool |
| Odor Control | Chemical treatments | Naturally antimicrobial |
| Microplastics | 700K fibers/wash | Zero |
| Thermoregulation | Traps heat | Active temp regulation |
| Certifications | Usually none | OEKO-TEX · RWS · BSCI |
| End of Life | 200+ years in landfill | Fully biodegradable in 12-18 months |
| Wearability | Wash after every use | Multiple days between washes |
What Customers are Saying
From verified Aiua customers
"I've probably purchased merino shirts from 15 different companies trying to find the right fit, and these are easily some of my favorites. Perfect lightweight summer merino shirt. At 6'2" and 175 lbs, finding merino shirts that are actually long enough is somehow harder than assembling IKEA furniture without leftover screws. These fit just right. Not skin tight, not baggy, just super comfortable."
"So comfy. It was perfect for my Pilates class. And no smell :)"
"The tshirt is so comfortable and soft - it's a clear upgrade from my normal gymwear!"
"I love this shirt! It's super comfortable and breathable both for working out and just wearing wherever. And I like the kinda cropped fit that goes perfectly with high waisted leggings and pants."
Performance Without the Plastic Fabric.
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