60-day risk-free trial  ·  Free shipping  ·  Full refund if you're not convinced

100% Natural Fibers  ·  Zero PFAS  ·  Zero Microplastics  ·  GOTS + OEKO-TEX Certified

Nothing toxic touches your skin.
ever.

The only athletic short for men who train hard and refuse to absorb chemicals while doing it. 100% Merino Wool liner. 100% Organic Cotton shell. Zero PFAS. Zero BPA. Zero microplastics.

Train Naturally - 60 days risk free

The Problem

Every rep in polyester, your skin absorbs what's in it.

Most gym-goers never question what's in their shirt. They just lift.

 

Exercise opens your pores and drives blood to the skin's surface. The same process drives anything pressed against your skin directly into your bloodstream. Independent testing by Mamavation found PFAS in 1 in 4 workout garments. Polyester athletic shirts have been found to contain BPA at elevated levels. And your skin absorbs chemicals up to 50% faster during exercise — when blood flows to the surface and pores dilate. Every session.

 

You're training for your health. Your shirt is working against it.

1 in 4

Athletic garments
testing PFAS-positive

50%

Faster chemical skin
absorption during exercise

Save 25% + Free Shipping

The Problem

Your shorts are made of plastic. And that plastic is absorbing into your skin right now.

When you sweat, your pores dilate, your sweat acts as a solvent. The PFAS, BPA, and microplastics in your polyester shorts don't sit on the surface. They dissolve into that sweat and absorb directly through your skin. 

 

Independent testing found PFAS in 1 in 4 workout garments. BPA has been detected in polyester-spandex blends at levels 40x California's safe exposure limit.

 

The fitness industry spent decades convincing you that polyester is performance. It's cheap to manufacture. That's why they use it.

1 in 4

GymWear
testing PFAS-positive

50%

Faster chemical skin
absorption during exercise

Save 25% + Free Shipping

The Difference

Six reasons nature outperforms plastic.

✔️ Zero endocrine disruptors.

Polyester and nylon release BPA and phthalates — synthetic chemicals shown to disrupt hormone production in athletes. 18.5-micron merino is a natural protein fibre with zero synthetic polymer content.

✔️ 7 sessions. Zero washes. Still fresh.

Merino's keratin and lanolin structure prevents bacterial colonisation at the fibre level. It doesn't fade. It doesn't wash out. Your polyester shorts has a permanent bacterial colony after six months. This one doesn't.

✔️ 30% moisture absorption before you feel wet.

Merino absorbs up to 30% of its weight in moisture while the outer surface stays hydrophobic. No clammy feeling. No chemical wicking treatment required.

✔️ Cool in summer. Warm in winter. No chemistry required.

The crimped fibre structure traps air for insulation while releasing heat when your body temperature rises. The same shorts that keeps you warm on a cold morning manages heat in the stuffy gym.

✔️ 18.5 microns. Zero itch.

Itch comes from coarse fibres above 25 microns that poke the skin rather than bend. At 18.5 microns — finer than cashmere — the fibre bends on contact. Most athletes who've written off merino tried 25+ micron wool. Different product.

✔️ The only gym shorts that biodegrades.

When this shorts reaches end of life, it returns to the earth. Your polyester shorts will still be shedding microplastics in 2150. That's not sustainability. That's debt.

30%

Moisture held before feeling wet — vs <1% polyester surface wicking

18.5μm

Merino fibre diameter — finer than cashmere, zero itch threshold

4.9★

Average rating from 2,612+ verified athletes.

5 days

Worn consecutively without washing — zero odour, blind test confirmed

The Science

We don't say clean. We prove it.

Third-party certifications. Named research. Specific test results. Because 'our product is safe' from a brand means nothing. Proof does.

Certifications

GOTS Certified

Global Organic Textile Standard — highest standard for organic textile processing worldwide

OEKO-TEX Standard 100

Independently tested for 100+ harmful substances including PFAS, BPA, heavy metals, and formaldehyde

BPA-Free — Independently Tested

Third-party lab verification. Not just a brand claim.

PFAS-Free — Independently Tested

No per- or polyfluoroalkyl substances. Verified, not implied.
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts
100% Natural Merino Wool & Cotton Gym Shorts

100% Natural Merino Wool & Cotton Gym Shorts

2,500+ Verified Reviews!

+ LIMITED TIME OFFER: FREE GIFT

The Complete Marathon Training System

Premium Gym Shorts made out of ultra-fine Australian Merino Wool and Organic Cotton. Free of any chemical treatments, microplastics and toxins without sacrificing performance.

Title

Tell me more about

  • Benefits

  • Zero Plastics

  • GUARANTEE

Train Harder. Train Healthier.

Kills odor naturally for fresh shorts

No BPA & PFAs for a toxin free workout

Ultra-fine Wool for zero irritation

Thermoregulation for training in all climates

Anti-microbial means more runs in less washes

Ultra-durability. Buy once and train for years

We created these shorts because conventional activewear exposes gym goers to a dangerous cocktail of chemicals. Every workout in synthetic gear means BPA, PFAS, phthalates, and microplastics absorbing through your sweat-soaked skin—chemicals linked to hormone disruption, fertility issues, and chronic skin problems affecting 60-70% of sensitive-skin individuals.

 

We engineered a better solution: two-layer natural fiber construction using merino wool and cotton that delivers genuine performance without the toxic load. Train healthy, not hazardous.

Train in them. Race in them. Put them through your toughest training. If these shorts don't deliver the best performance and comfort you've ever experienced, if you don't feel the difference of running chemical-free, simply return them within 90 days for a full refund. No questions asked. No fine print. We'll even cover return shipping.

 

Why offer this guarantee? Because we know once you experience natural fiber performance without the chafing, rashes, and toxic chemical exposure of synthetic gear, you'll never go back.

Due to high demand, Gray and Navy shorts are sold out. 

Black are still in stock!

Here's how you're SAVING money

Yes, we're good quality and expensive but here's why you're actually SAVING money (and your health)

 

THE REAL COST:

Synthetic shorts cost $40-60 but last only 12-18 months before the elastic stretches, fabric pills, and the smell becomes permanent.

Over 3 years: $120-180 in replacements
Zero Plastic shorts: $75 (customers report 3-5+ years, still looking new)

 

THE HEALTH COST YOU CAN'T CALCULATE:

Your synthetic shorts are plastic. They contain BPA, PFAS ("forever chemicals"), and phthalates (the same hormone disruptors banned from water bottles)

 

When you run, your pores open and these toxins absorb directly through your skin into your bloodstream.

Studies show:

  • BPA levels 2x higher in polyester fabrics
  • 65% of activewear contains PFAS
  • Active Gear expose wearers to 22x BPA's safe limit

What's the cost of hormone disruption? Fertility issues? Long-term health effects?

 

Zero Plastic shorts:

  • $75, lasts 3-5+ years
  • 100% natural fibers
  • Permanently odor-resistant
  • Still looks new after years

3-year comparison:

  • Synthetics: $120-180 + constant chemical exposure
  • Zero Plastic: $75 + peace of mind

Try them risk-free for 90 days. Run without plastic. Run healthier.
Quantity

Our Moneyback Guarantee

Try them for 90 days. If you don't love them, we'll refund every cent. Free return shipping included. No questions asked. Just email support@zeroplasticperformance.com

Product Information

  • 19.5 Micron Merino: Softer than cotton. Verified pure.
  • Woolmark Certified: No blends. No shortcuts.
  • GOTS Certified Cotton: Grown without a single chemical.
  • OEKO-TEX® Standard 100: Every part tested skin-safe.
  • Bluesign® Approved: Zero harmful substances. Period.
  • 100% Plastic-Free: No polyester. No toxins. Ever.

Shipping and Delivery

FREE SHIPPING: All orders ship free, no minimum purchase required.

PROCESSING TIME: Orders ship next business day (Monday-Friday, excluding holidays).

DELIVERY TIME: 7-10 days from ship date.

TRACKING: You'll receive tracking information via email once your order ships.

RISK-FREE RETURNS: 90-day return window with free return shipping. No questions asked.

Sizing Guide

Size chart

All measurements in inches. Waist measurements taken at natural waist.

⚠ These shorts run small — we recommend ordering one size up from your usual size.
Size US Waist (in) Waist (Relaxed) Waist (Stretched) Hip Outseam
S 26–28 13.5" 21.5" 39.0" 16.4"
M 28–30 14.5" 23.5" 41.0" 17.0"
L 30–34 15.5" 25.5" 45.0" 17.7"
XL 34–38 16.5" 27.5" 47.0" 16.4"

* Sizing updated — if you previously ordered a size up, we recommend ordering your usual size.

For the Runner Who Optimizes Everything

You track your macros. You filter your water. Your gym shorts are next.

The health-optimized man doesn't accept standard inputs. He checks every label. He reads the research. He's already made the hard choices. But most men still wear plastic to the gym because the fitness industry spent decades conditioning them to believe polyester is performance.

 

It isn't. It's cheap to manufacture. Zero Plastic Performance exists for the man who's already made every other clean choice. This is the last one.

Switched to filtered water

Cut seed oils from your diet

Training 4–6 days per week, year-round

Tracking HRV, sleep, and macros

Still running in a polyester short

The Comparison

100% natural isn't a marketing claim. It's a material difference.

Icebreaker and Smartwool blend with nylon. Their fibres still shed microplastics. "Merino" in the name doesn't mean clean. Check the label

Feature

Polyester Synthetic

    Merino Blend
(Icebreaker, Smartwool)

ZPP 100% Natural

PFAS detected

Yes - 1 in 4 brands

Possible (nylon content)

Zero - independently tested

Microplastics per wash

700,000+ fibres

Yes (synthetic content sheds)

Zero

Odour after 5 runs

Yes — permanent

Partial resistance

No — natural antimicrobial

100% natural fibres

No

No — nylon/polyester blend

Yes — no exceptions

Biodegradable

No (500+ years)

No (synthetic content persists)

Yes — fully

Certifications

None

Limited

GOTS + OEKO-TEX Standard 100

Lifespan

6–12 months

12–18 months

3+ years with care

Verified runners

What men who read the label are saying.

Common Questions

Straight Answers

Won't wool be itchy?

Not a chance. Our merino fibers are 18.5 microns, finer than a human hair. That's a completely different beast from the scratchy wool sweater you're thinking of. Most guys describe it as the softest shirt they own.

Is it going to be too hot for the gym?

Nope. Merino actually thermoregulates in both directions. It keeps you cool when you're hot and warm when you're not. Unlike polyester, which traps sweat against your skin, merino moves moisture through the fiber so you actually feel dry. It works the same way in summer as it does in winter.

Can it really handle heavy lifting and intense training?

Yes. The fiber has natural stretch, so your range of motion isn't limited. Guys have worn these through full lifting sessions, HIIT, and long runs without issues. It's not just for hiking; this tee was built with gym performance in mind.

Why does it cost so much?

Think of it as cost-per-wear, not cost-per-shirt. You're probably already spending $65 to $90 on a polyester tee. This is the same price, except you'll wear it 3 to 5 times between washes, it won't lose its performance after 50 washes, and it isn't leaching plastic chemicals into your body every session. The math actually works out in your favor.

Will it get holes?

We'll be straight with you. 100% merino is a fine fiber, so it needs slightly more care than a cheap polyester tee. That said, our construction is built for gym use specifically (not ultralight travel weight), and if anything happens within 60 days, we've got you covered. Treat it right and it'll outlast every synthetic tee in your drawer.

How do I wash it without ruining it?

Cold wash, gentle cycle, air dry. That's it. The good news? Because merino naturally resists odor, you wash it way less often, which means it lasts longer and you save on laundry.

Will it dry fast enough after I sweat?

Merino absorbs moisture into the fiber rather than leaving it sitting on your skin, so even while it holds some moisture, you won't feel soaked or clammy mid-workout. It dries a little slower than polyester on a hanger, but during training it actually feels drier. Big difference.

 How do I know the "no toxins" claim is actually real?

Fair question, and you should ask it. Ours is third-party verified. Look for OEKO-TEX and GOTS certification on our product page. Those aren't brand claims; they're independent labs testing for 1,000+ harmful substances including PFAS, BPA, and phthalates. The certifications don't lie.

Isn't "recycled plastic" activewear already the sustainable option?

Recycled polyester is still plastic. It still sheds microplastics every wash. It still sits against your skin while you sweat. "Recycled" is an environmental story, not a health story. We're solving a different problem entirely.

Zero Plastic Performance

100% natural merino wool activewear. No synthetics. No PFAS. No compromise.

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