| Inseam | Waist |
| 5" - 7" | 28-30" (S) |
|
5" - 7" |
30-32" (M) |
|
5" - 7" |
34-36" (L) |
|
5" - 7" |
38-40" (XL) |
| 5" - 7" | 42-46" (XXL) |
DITCH TOXIC GYM SHORTS
Switch to All Natural
The 2-In-1 Gym Short Built with Zero Synthetics
Made to train hard. Made to live in.
100%
Organic Cotton Outer
100%
Merino Wool liner
0 PFAS. 0 POLYESTER. 0 FOREVER CHEMICALS
Third-party tested for fiber composition
99-Day Guarantee
Every “Great” Gym Short is Made of Plastic
Go ahead. Check the inside label of your favorite pair.
Polyester.
Nylon.
Elastane.
Plastic blends… marketed as “performance.”
It wicks… until it stinks.
It stretches… until it sags.
It feels “light”… until it turns into a sweaty, clingy bin bag.
Most men accept it because they think there’s no alternative.
There is.
The Problem With Plastic Shorts
Plastic doesn’t “breathe.” It vents, and then traps heat where it counts.
Plastic doesn’t “stay fresh.” It holds odor and demands constant washing.
Plastic doesn’t “last.” It pills, shines, and sheds.
And you wear it in the exact place you should be most careful with.
So we built the opposite.
The Nero Solution: A Natural 2-Layer System
Most brands chase “performance” by adding more synthetics. Nero does it the old way: better raw materials.
Organic Cotton Outer
The structure. The drape. The “this looks expensive” effect. A short that doesn’t scream gym cosplay.
Merino Wool Liner
The comfort layer. The sweat manager. The reason you can wear them again without washing. No plastic required.
Top 5 Asked Questions
Isn’t merino wool itchy?
No. We use 17.5-micron superfine merino, ultra-fine fibres similar to what Loro Piana uses. Soft against skin. Zero scratch.
Why no polyester or nylon?
Because performance doesn’t have to mean plastic. Organic cotton outside. Merino wool liner. Nothing synthetic touching your skin.
Will cotton feel heavy when I train?
Not the way we build it. The outer gives structure, the merino liner manages moisture and keeps you comfortable.
Do they smell after workouts?
Merino naturally resists odor buildup better than synthetic liners. Less stink. Less washing.
Are they actually built for training?
Yes, but designed to look elevated enough for everyday wear. One short, not two wardrobes.
Active Merino Liner Short
merino wool
Regular price
£70.00
Regular price
Sale price
£70.00
Unit price
per
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Features & details
Features & details
Two open pockets and a secure zip pocket keep essentials close, while the merino liner naturally regulates temperature and resists odor.
Built with a 100% GOTS organic cotton shell and a 100% ultra-fine 17.5-micron merino wool liner for unmatched comfort and performance.
Fabric & care
Fabric & care
- 17.5 Micron Count (Super fine wool)
- Fibre composition verified (ISO:TR:11827)
- Woolmark certified Pure Merino
- GOTS-certified 100% organic cotton shell
- OEKO-TEX® compliant dyes
- Zero polyester. Zero synthetics.
- Tested by Dr. PH Greaves, Microtex Lab
Shipping, returns & exchanges
Shipping, returns & exchanges
- We ship worldwide.
- Tracked free shipping on 2+ items.
- You have 99 days to return or exchange.
- All returns are free.
Fit & sizing
Fit & sizing
Fit: True to size, designed for an athletic fit
Small: 28-30"
Medium: 30-32"
Large: 34-36"
XL: 38-40"
XXL: 42-46"
Your Order Supports Farmers
Your Order Supports Farmers
Nero stands with farmers. While the big sportswear giants fuel plastic factories, we choose to work with those who raise sheep, grow cotton, and keep real fabrics alive.
Every order is a step toward a future where natural wins over synthetic, and where farmers, not oil companies, get supported.
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Over 30,000+ Shorts Sold
Frequently Asked Questions
Why don't big brands use natrual fabrics?
-
Mostly because synthetics are cheaper, easier to scale, and simpler to manufacture. Polyester costs a fraction of natural fibres, holds colour consistently, and fits fast-fashion production timelines, which works well for mass-market margins.
Is your wool superwashed?
+
No, we don’t use superwash treatments.
Our merino wool remains natural and untreated, without the plastic-based coatings often used in superwash processes. This keeps the fibre closer to its natural state.
What makes it odor/stink free?
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It comes down to merino wool’s natural structure. Unlike synthetic fibres that trap odor-causing bacteria, merino helps regulate moisture and creates a less hospitable environment for smell to build up.
Just normal washing?
+
Just keep it simple, wash on a cold cycle and hang dry. This helps protect the natural fibres, maintain shape, and extend the life of your garments.
What micron count is the merino wool?
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We use 17.5-micron merino wool, chosen for its balance of softness, durability, and performance. It’s fine enough to feel comfortable directly on skin while still strong enough for training and everyday wear.
99-Day guarantee—really?
+
Yes, really.
You have 99 days to wear, train, and live in your Nero pieces. If they’re not right for you, you can return them. We built Nero to be worn in the real world, not just tried on in a bedroom, so our guarantee reflects that confidence.
What material is the waistband?
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The Nero waistband is made from 80% organic cotton and 20% natural rubber, giving it comfortable stretch without using plastic-based elastics. Unlike typical synthetic waistbands, natural rubber provides flexible support while remaining fully biodegradable and aligned with our natural-fibre philosophy.
What’s Nero’s big vision?
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Nero exists to lead the zero-plastic future of performance.
Our mission is to redefine activewear using natural, high-performance fibres, and become the category leader in natural performance.