You are running a $6M to $40M activewear brand. You have built your line on polyester blends because the cost math worked. In 24 months, that math changes. The regulatory floor on PFAS is moving. The consumer conversation about microplastics in clothing is no longer niche. And your customer is starting to ask a question you have not had to answer before: what is this fabric doing to my skin when I sweat?
This brief walks through what the Tencel vs polyester activewear decision looks like by 2028, what it will cost you to move, and what you need to do this quarter to protect your margins.
The category in 24 months
The consumer conversation has shifted. On its website, Patagonia said it wanted to stop using virgin polyester by the end of 2025 due to its "high environmental cost." The company told NPR that about 94% of the polyester it currently uses is recycled. This is a major outdoor brand signaling the direction of travel.
The social media framing is blunt. Creators are pointing out that polyester, nylon, and elastane are petroleum-based and processed with chemicals like phthalates, bisphenols, and PFAS. When we wear, wash, and sweat in these fabrics they shed microplastics. These particles are now being found in human blood, lungs, and even plaque in our arteries. Content cites data that individuals with microplastic buildup have 4.5 times greater risk for stroke and heart attack.
This is not a positioning problem you can message your way out of. Your product page lists 82 percent polyester. Your customer has learned to read labels.
By 2028, the brands that have moved to PFAS-free, low-synthetic activewear will own the credibility layer in search, in social discovery, and in the answer-engine results that are increasingly driving purchase intent. The brands that have not will be explaining themselves.
What your customer is going to ask
The questions are already in creator content and product reviews. Expect them in your customer service inbox by Q1 2027:
- Is this fabric plastic?
- Does this leach chemicals when I sweat?
- Is this PFAS-free? Can you prove it?
- What happens to this fabric after I throw it away?
The framing from non-toxic activewear advocates is direct: when it comes to activewear, it is important to pause and consider what you are putting on your skin, especially when you are planning on breaking a sweat. During exercise, your skin becomes more absorbent, making it easier for harmful substances in clothing to be absorbed into your body.
This is not an objection you handle in marketing copy. It is a fabric decision.
The science your customer is citing
A 2024 University of Birmingham study published showed that as much as 8% of the chemical exposed could be taken up by the skin, with more hydrated or "sweatier" skin absorbing higher levels of chemical.
The study offers the first experimental evidence that chemicals present as additives in microplastics can leach into human sweat, and then be absorbed through the skin, into the bloodstream. The research used 3D human skin equivalent models to simulate real-world exposure.
The researchers found that a sweaty skin enhances dermal bioavailability of some PBDEs, and that exposure via skin contact with microplastics containing PBDEs contributes to their body burdens. For activewear, this is the exposure scenario.
Your customer is not reading the primary literature. But the creators summarizing it are getting millions of views. Many synthetic garments, especially activewear, are treated with chemicals such as PFAS to improve performance. A 2024 study by the University of Birmingham found that microplastics can carry these substances into the skin.
Why Tencel lyocell performs
Tencel lyocell is the leading non-synthetic alternative for performance activewear. It is not a compromise fabric.
Tencel lyocell pulls moisture away from the skin and releases it quickly. That helps you stay dry and comfortable, even when you are moving or sweating. Lenzing studies show it absorbs significantly more moisture than cotton, which is why it performs well in activewear. Because moisture does not linger in the fabric, odor-causing bacteria have a harder time building up.
A plant-based fiber with major performance benefits, Tencel always excels, with a much lower eco footprint than traditional synthetic activewear. Tencel lyocell's performance qualities are similar to polyester, but with the breathability of cotton and the drape and hand feel of silk.
The material dries nearly three times as fast as merino wool. This matters for activewear where quick-dry is a table-stakes claim.
The limitation: Tencel lacks inherent stretchability, necessitating blends with other materials for enhanced elasticity. For leggings and fitted pieces, you will need a stretch component. Most stretchy activewear uses conventional elastane, which may contain concerning additives. Newer options like bio-based elastane offer the same performance with better environmental and skin safety profiles.
Some activewear brands use as little as 50-70% Tencel, filling the rest with polyester or nylon to cut costs. Higher Tencel content (90%+ for tops, 80%+ for leggings) means better moisture management, skin comfort, and fewer synthetic materials against your skin.
The cost math
Here is where the decision gets real.
As of 2025, virgin polyester averages $0.85 to $1.05 per kg, while recycled polyester averages $1.10 to $1.40 per kg due to extra processing and sustainability certifications.
Retail Tencel lyocell fabric runs approximately $28 to $48 per yard depending on composition and weight. At wholesale MOQ volumes, that drops to approximately $15 to $25 per yard for blends.
Let me translate this to garment-level COGS for a mid-weight legging:
Current polyester-spandex legging:
- Fabric cost (polyester-spandex, 180 GSM): approximately $3.50 to $4.50 per unit
- Total landed COGS: approximately $11 to $13
Tencel-blend legging (80% Tencel, 20% bio-based elastane):
- Fabric cost: approximately $6.50 to $8.50 per unit
- Total landed COGS: approximately $15 to $18
Your COGS goes from approximately $12 to approximately $16.50. At a $78 ASP, your gross margin moves from 85% to 79%. At a $58 ASP, it moves from 79% to 72%.
This is not a margin you can absorb if you are running a 30% CAC load and a 15% return rate. You have two paths:
- Raise ASP. Move from $58 to $68. Your customer who is asking about PFAS is also the customer who will pay for proof.
- Blend strategy. Run 70% Tencel, 25% recycled polyester (GRS-certified), 5% bio-elastane. Your fabric cost drops to approximately $5.50 to $7.00 per unit. You lose the "plastic-free" claim but keep "low-synthetic" and "PFAS-free" positioning.
The blend path is where most brands will land by 2028. Pure Tencel activewear is a premium play. But the regulatory floor is going to force everyone off intentionally-added PFAS, which means your fabric sourcing changes regardless.
Where the regulatory floor is moving
The PFAS landscape is a patchwork, but the direction is clear.
In Maine, a broad ban on unnecessary uses of PFAS is taking effect across products such as clothing, cleaning products, cookware, dental floss, children's products, food packaging, menstrual products, personal care products, ski wax, and textiles. This follows Minnesota's similar law and aligns with both states' plans to ban all unnecessary PFAS uses by 2032.
Colorado, Vermont, and Washington introduced new prohibitions effective January 1, 2026, covering consumer categories including cosmetics, textiles, cookware, and cleaning products.
California AB 1817 bans textile articles (clothing, bedding, towels) with intentionally added PFAS. Effective January 1, 2025, with outdoor apparel for severe wet conditions following on January 1, 2028.
California's total organic fluorine threshold will be reduced further to 50 ppm beginning January 1, 2027. The California law broadly defines textile articles, covering apparel, accessories, bedding, towels, and more.
In the EU, the timeline is slightly longer but the scope is broader:
Regulation of PFAS under REACH in the EU and EEA by means of a broad restriction of production, use, and placing on the market is moving forward towards adoption in 2027. On 26 March 2026, the European Chemicals Agency launched its final consultation on the proposed restriction of PFAS, which is one of the most significant regulatory developments in EU chemicals law in recent years.
France Law No. 2025-188 with Decree no 2025-1376 bans the manufacture, import, export, and sale of PFAS-containing textiles, footwear, and waterproofing agents for consumer use, effective January 2026.
PFHxA is now itself getting restricted under REACH Entry 79, with bans starting in October 2026. If you switched from PFOA to PFHxA-based chemistry, you are about to face another transition.
If you are selling into California, New York, the EU, and the UK, your fabric choices are converging on PFAS-free by 2028 regardless of your brand positioning.
What to do this quarter
- Audit your current fabric specs for total organic fluorine. If you are above 50 ppm, you are non-compliant in California by January 2027. Get a test report from your mill.
- Source a Tencel-blend sample run. 70-80% Tencel, bio-based elastane, no PFAS finishes. Get pricing at 5,000-unit MOQ. Compare landed COGS to your current polyester blend.
- Test consumer response. Run a pre-order or waitlist for a single "plastic-free" or "low-synthetic" SKU. Measure conversion against your current hero legging.
- Update your PDP copy. If your product is already PFAS-free, say so. If you have certifications, surface them. Brands like Toad&Co offer select activewear items featuring blends of Tencel lyocell and organic cotton, with certifications like OEKO-TEX and bluesign and a commitment to ethical production.
What to do in the next 12 months
- Build the transition roadmap. Identify which SKUs can move to Tencel blends without major pattern or fit changes. Tops are easier than leggings. Start there.
- Renegotiate mill contracts. If your mill cannot supply PFAS-free, Tencel-compatible fabric at scale by Q3 2027, you need a new mill relationship.
- Develop your proof layer. Third-party testing. Certifications. Lot-level documentation. The brands that win the next 24 months are the ones that can answer "can you prove it?" with a link, not a claim.
- Adjust your ASP model. If you are moving to Tencel blends, you need to price for it. Run the margin math at $68, $78, $88. Know where your break-even CAC lands.
The plastic-free activewear guide maps the full category and the brands that have already made the move. Use it to benchmark your timeline.
Platforms like OHZEHN-TEX exist because the proof layer is the hard part. The fabric is available. The cost math is workable. The documentation and certification infrastructure is what most brands are missing.
The regulatory floor is moving. The consumer question is landing. The brands that move in the next 12 months will own the category by 2028. The brands that wait will be explaining why their leggings are still 82 percent polyester.
Sources
https://www.npr.org/2026/01/20/nx-s1-5670290/polyester-fabric-clothing https://www.tiktok.com/discover/what-is-petroleum-based-active-wear https://tripulse.co/blogs/news/tripulse-co-tencel-vs-cotton-guide https://www.toadandco.com/pages/tencel-clothing https://www.sportcasuals.com/news/tencel-fabrics-activewear https://www.moodfabrics.com/collections/tencel-fashion-fabrics https://www.birmingham.ac.uk/news/2024/toxic-chemicals-from-microplastics-can-be-absorbed-through-skin https://www.sciencedirect.com/science/article/pii/S0160412024002216 https://tripulse.co/blogs/news/how-to-avoid-microplastics-in-clothing-a-step-by-step-guide https://www.urbanwellnessmag.com/blog/nontoxic-activewear https://szoneierfabrics.com/polyester-clothing-cost-analysis-fabric-labor-and-logistics-breakdown/ https://www.saferstates.org/resource/2026-analysis-of-state-policy-addressing-toxic-chemicals-and-plastics/laws-going-into-effect-in-2026/ https://www.innovationnewsnetwork.com/pfas-product-bans-expand-in-2026-as-us-state-laws-take-effect/68718/ https://nontoxiclab.com/pfas-state-ban-tracker-2026/ https://sustainabilityservices.eurofins.com/news/2025-pfas-regulations-the-global-landscape/ https://www.whitecase.com/insight-alert/europes-pfas-restriction-proposal-moving-forward https://www.bluesign.com/pfas-in-clothing https://tocco.earth/article/which-eu-pfas-ban-applies-to-your-brand