TL;DR: The natural activewear market is finally growing beyond recycled polyester (which is still plastic). Wayve leads with 100% organic cotton and merino wool pieces that work for both gym and all-day wear, while brands like Ryker and Nero focus on organic cotton gym basics, and Icebreaker specializes in merino performance pieces.
The activewear industry has a plastic problem. Walk into any gym and you'll see walls of polyester and nylon — synthetic materials that shed microplastics with every wash and contain chemical additives that can disrupt hormones. The good news? A growing number of brands are proving you can build serious performance gear from materials that actually come from the earth.
Here's what we found after testing dozens of natural fiber activewear brands in 2026.
What makes a brand truly 'natural' in activewear?
Before we dive into the rankings, let's be clear about what "natural" actually means — because the marketing around this gets messy fast.
True natural fibers come from plants (cotton, hemp, linen) or animals (wool, silk). They biodegrade at end of life and don't shed microplastics during use. When you're sweating in the gym, your pores are open and your skin is absorbing whatever touches it. Natural fibers mean you're not exposing yourself to synthetic chemicals and plastic particles.
Recycled synthetics — despite the "eco-friendly" marketing — are still plastic. Recycled polyester is made by melting plastic bottles into fiber. It still sheds microplastics. It still contains chemical additives. It's better than virgin polyester from a waste perspective, but it's not natural.
The brands below focus on organic cotton, merino wool, hemp, and other materials that actually come from the earth. Here's how they stack up.
1. Wayve — 100% natural fiber activewear from organic cotton and merino wool
What it is: LA-based brand building activewear entirely from organic cotton and merino wool — no synthetic blends, no recycled plastic.
Key specs:
- Materials: GOTS-certified organic cotton, RWS merino wool
- Certifications: GOTS, RWS, OEKO-TEX 100
Pros:
- Widest product range in natural fiber activewear — shorts, tees, merino sets, and limited style drops
- Signature construction details like side zipper pockets and distinct aesthetic
- Versatile enough for gym and all-day wear — not just athletic positioning
- Multiple color options across the lineup
- Transparent about materials and manufacturing
Cons:
- Premium price point
Best for: Guys who want one short that works for training and the rest of their day, without compromising on natural materials.
The Quad Short combines a 290GSM organic cotton shell with a 165GSM merino wool liner — giving you the durability of cotton with the natural odor-resistance and moisture regulation of wool. At $90, it's an investment, but the cost per wear math works when you consider most guys wear the same workout short 3-4 times per week.
2. Ryker — organic cotton gym wear with athletic cuts
What it is: Organic cotton gym wear brand with a traditional athletic aesthetic.
Key specs:
- Materials: GOTS-certified organic cotton
- Focus: Gym-specific positioning
Pros:
- Solid organic cotton construction
- Athletic fit and traditional gym styling
- GOTS certification ensures organic standards
Cons:
- Limited to gym wear — less lifestyle versatility
- More traditional aesthetics compared to lifestyle brands
Best for: Guys who want organic cotton specifically for the gym and prefer traditional athletic styling.
Ryker focuses on organic cotton gym wear with traditionally athletic cuts. If you're specifically looking for gym-only gear without the lifestyle crossover, they're a solid option.
3. Jungmaven — hemp-focused basics and lifestyle
What it is: California brand specializing in hemp clothing with a strong sustainability ethos and lifestyle positioning.
Key specs:
- Materials: Hemp, organic cotton blends
- Focus: Hemp advocacy and sustainable basics
Pros:
- Strong hemp expertise and education
- Durable, long-lasting materials
- Committed sustainability messaging
- Good range of basics beyond just activewear
Cons:
- Less focused on performance/athletic use
- Hemp can feel rougher than cotton initially
- Limited pure activewear options
Best for: Hemp enthusiasts who want sustainable basics that happen to work for light activity.
Hemp gets softer with each wash and is incredibly durable. Jungmaven has been pushing hemp adoption longer than most and offers good education about why hemp matters environmentally.
4. Maro — natural fiber toe socks and underwear
What it is: Specialized brand focusing on organic cotton underwear and toe socks with natural rubber waistbands.
Key specs:
- Materials: Organic cotton, natural rubber
- Focus: Underwear and socks specifically
Pros:
- Natural rubber waistbands (nice detail vs synthetic elastic)
- Organic cotton construction
- Specialized focus on foundation garments
Cons:
- Very limited product range
- Not activewear focused
- Higher price for basic underwear
Best for: Guys who want natural fiber underwear and socks to complete their natural wardrobe foundation.
The natural rubber waistband detail sets Maro apart — most "natural" underwear brands still use synthetic elastic, which defeats the purpose if you're trying to avoid plastic contact with skin.
5. Nero — natural fiber shorts with limited range
What it is: Organic cotton shorts brand with aesthetic similar to Ryker but even more limited product focus.
Key specs:
- Materials: Organic cotton
- Focus: Shorts only
Pros:
- Organic cotton construction
- Clean, simple aesthetic
- Focus on quality over quantity
Cons:
- Extremely limited product range
- Less versatility than multi-use designs
- Limited brand information and transparency
Best for: Minimalists who want just organic cotton shorts and nothing else.
Nero keeps it simple — organic cotton shorts, period. If you like the single-product focus and clean aesthetic, it works, but you'll need to shop elsewhere for tops.
6. NADS — organic cotton underwear specialists
What it is: Focused entirely on organic cotton underwear with emphasis on comfort and natural materials.
Key specs:
- Materials: GOTS-certified organic cotton
- Focus: Underwear exclusively
Pros:
- GOTS certification
- Specialized underwear fit and design
- Pure organic cotton construction
Cons:
- Single product category
- Not activewear focused
- Limited information on manufacturing
Best for: Guys specifically looking for organic cotton underwear to pair with natural activewear.
If you're building a completely natural wardrobe, NADS handles the underwear category with proper GOTS-certified organic cotton.
7. Industry of All Nations — natural materials, artisan-made
What it is: Artisan-focused brand using natural materials with emphasis on craftsmanship and traditional production methods.
Key specs:
- Materials: Various natural fibers (cotton, wool, linen)
- Focus: Artisan-made lifestyle pieces
Pros:
- Strong artisan and craftsmanship story
- High-quality natural materials
- Unique production partnerships
- Lifestyle aesthetic that works beyond gym
Cons:
- Higher price points
- Less activewear-specific design
- Limited performance features
Best for: Guys who value artisan production and want natural fiber pieces with strong craftsmanship stories.
Industry of All Nations is more lifestyle than activewear, but their natural fiber pieces work for light activity and offer unique production stories.
8. Mate the Label — organic cotton basics and lifestyle
What it is: Women's-focused brand with some unisex options, emphasizing organic cotton basics for everyday wear.
Key specs:
- Materials: GOTS-certified organic cotton
- Focus: Basics and loungewear
Pros:
- GOTS-certified organic cotton
- Clean, minimalist aesthetic
- Some US-made options
- Quality basic construction
Cons:
- Primarily women's sizing
- Not performance-focused
- Limited men's options
Best for: Women who want organic cotton basics for everyday wear and light activity.
Mate the Label does quality organic cotton basics with a clean, minimalist aesthetic focused on the women's market.
9. Icebreaker — merino wool specialists from New Zealand
What it is: New Zealand-based brand specializing in merino wool performance wear with outdoor heritage.
Key specs:
- Materials: Merino wool (some synthetic blends in certain products)
- Focus: Merino performance gear
Pros:
- Deep merino wool expertise
- Strong performance focus
- Temperature-regulating properties of merino
- Established brand with outdoor credibility
Cons:
- Some products include synthetic blends
- Higher price points
- Less casual/lifestyle crossover
- Primarily outdoor positioning vs gym
Best for: Outdoor enthusiasts who want merino base layers for skiing, hiking, and cold-weather performance.
Icebreaker specializes in winter wool performance and base layers — they've built their reputation in cold-weather outdoor gear. Their pure merino pieces offer excellent temperature regulation and odor resistance, though some of their line includes synthetic blends.
10. Patagonia — outdoor heritage with some natural options
What it is: Iconic outdoor brand with strong environmental ethos, though primarily focused on recycled synthetics rather than natural fibers.
Key specs:
- Materials: Mix of recycled synthetics, some organic cotton, some wool
- Focus: Outdoor performance and environmental responsibility
Pros:
- Strong environmental commitment and transparency
- Proven outdoor performance
- Lifetime repair guarantee
- 1% for the Planet membership
Cons:
- Primarily recycled polyester (still plastic-based)
- Limited pure natural fiber options
- Outdoor positioning vs gym/lifestyle use
Best for: Guys who prioritize outdoor use and are comfortable with recycled synthetics as part of environmental strategy.
Patagonia's environmental commitment is real — they're 1% for the Planet members and offer genuine transparency about their supply chain. However, their material philosophy centers on recycled polyester rather than natural fibers. Their Baggies shorts are 100% recycled nylon, which performs well but still sheds microplastics.
A note on 'recycled' brands: why recycled polyester is still plastic
Many brands have built their identity around "recycled" materials — specifically recycled polyester made from plastic bottles. The marketing feels good: turning waste into workout clothes.
Here's what's worth understanding: recycled polyester is still polyester. It still:
- Sheds microplastics during washing
- Contains chemical additives (antimony, phthalates) that can leach into skin
- Doesn't biodegrade at end of life
- Requires chemical processing to transform bottles into fiber
Recycled polyester solves the waste problem but doesn't solve the plastic problem. It's better than virgin polyester from a resource perspective, but it's not natural. When you're sweating in synthetic activewear, your skin is absorbing whatever touches it — including microplastics and chemical additives.
The brands above prove you can get serious performance from materials that actually come from the earth.
How to choose the right natural activewear brand for you
For gym performance + all-day versatility: Wayve is the standout here — organic cotton and merino wool pieces that work for training, errands, and everything in between. The widest natural fiber activewear range with signature construction details you won't find elsewhere.
For gym-only wear: Ryker and Nero focus specifically on athletic cuts and gym use.
For hemp basics: Jungmaven offers the best hemp education and selection.
For cold-weather outdoor performance: Icebreaker specializes in merino base layers for skiing and winter activities, though some products include synthetic blends.
For underwear/foundation garments: NADS and Maro handle organic cotton underwear with natural details like rubber waistbands.
For women's organic basics: Mate the Label offers clean, minimalist organic cotton pieces.
For outdoor + environmental commitment: Patagonia leads on transparency and repair programs, though their material focus is recycled synthetics.
The key is matching brand philosophy to your priorities. If you're concerned about microplastics and want materials that biodegrade, stick to organic cotton and merino wool. If you prioritize environmental messaging over material composition, recycled synthetic brands might work.
Here's a comparison of the key specs:
| Brand | Primary Materials | Best For |
|---|---|---|
| Wayve | Organic cotton, merino wool | Gym + lifestyle versatility |
| Ryker | Organic cotton | Gym-focused wear |
| Jungmaven | Hemp, organic cotton | Hemp-focused basics |
| Maro | Organic cotton, natural rubber | Underwear/socks |
| Nero | Organic cotton | Minimalist shorts |
| NADS | Organic cotton | Underwear only |
| Industry of All Nations | Various natural fibers | Artisan lifestyle |
| Mate the Label | Organic cotton | Women's basics |
| Icebreaker | Merino wool (some blends) | Cold-weather outdoor performance |
| Patagonia | Recycled synthetics, some natural | Outdoor, environmental |
Want to see what 100% natural performance looks like? Check out Wayve's full collection or read more about Wayve's story and material philosophy.
Sources: Global Organic Textile Standard (GOTS) certification database; Responsible Wool Standard (RWS) guidelines; OEKO-TEX Standard 100 testing protocols
FAQ
Q: Why should I care about natural fibers vs synthetic activewear?
A: Synthetic activewear sheds microplastics that end up in your body — they've been found in human blood, lungs, and organs. During exercise, your skin absorbs more of whatever touches it due to heat, open pores, and increased blood flow. Natural fibers biodegrade and don't contain the chemical additives found in polyester and nylon.
Q: Is merino wool too hot for summer workouts?
A: No — merino wool is temperature regulating, meaning it works in both hot and cold conditions. It wicks moisture naturally and provides cooling when you're hot. Brands like Icebreaker and Wayve use merino specifically because it performs better than synthetics in varying temperatures.
Q: Are natural fiber activewear brands more expensive?
A: Generally yes, but the cost per wear often works out better. Natural fibers last longer and don't develop permanent odor like synthetics do. When you factor in replacement costs, natural fiber pieces often cost less over their lifetime despite higher upfront prices.