Recycled polyester has become the sustainability story of the activewear industry. Major brands have committed to using it across their lines. The environmental argument is straightforward: plastic bottles diverted from landfills and oceans, reformed into fiber, woven into leggings. It sounds like a problem solved.
It is a problem addressed. The supply chain improvement is real. The problems it does not solve are the ones that happen while you are wearing it. For women looking for safer activewear options, the distinction matters.
What recycled polyester actually is
Recycled polyester, often labeled rPET, is made by breaking down post-consumer plastic, typically PET plastic bottles, into its polymer components and re-extruding them as fiber. The resulting material is chemically identical to virgin polyester. It performs the same way, feels the same way, and behaves the same way in the wash and against your skin.
The environmental benefit is real and specific: it reduces demand for virgin petroleum and diverts plastic waste from disposal. That is a meaningful supply chain improvement.
It is not a material improvement. The fiber you are wearing is still polyester.
The microplastic problem recycled polyester does not solve
Every synthetic garment sheds microplastic fibers when washed. A 2011 study published in Environmental Science and Technology by Browne et al. found that synthetic garments shed plastic fibers during washing that accumulate in marine environments globally. A subsequent study published in Nature Food by Landrigan et al. (2021) detected microplastics in human blood samples, with polyethylene terephthalate, the polymer in both virgin and recycled polyester, among the most frequently identified.
Recycled polyester sheds microplastics at the same rate as virgin polyester. The fiber structure is identical. The shedding behavior is identical. The full picture on what this means, which fabrics shed the most, and how to reduce exposure is covered in the guide to microplastics in activewear. The question of whether recycled polyester sheds microplastics has a clear answer: yes, at the same rate as virgin polyester.
For women whose concern is what enters their body and the water supply during everyday use, this is the relevant distinction.
Chemical finishes: the same story
The chemical finish problem that applies to virgin polyester applies equally to recycled polyester. Most synthetic activewear, regardless of whether the base fiber is virgin or recycled, is treated with chemical finishes during manufacturing: water repellency treatments, antimicrobial coatings, and softening agents.
PFAS compounds have been documented in activewear products from multiple brands, as reported by the nonprofit MADE SAFE (2022). The US Environmental Protection Agency classifies certain PFAS compounds as probable human carcinogens. These finishes are applied after the fiber is produced. The recycled origin of the base fiber does not prevent them from being used, and they are not disclosed on product labels.
What TENCEL Lyocell addresses differently
TENCEL Lyocell is derived from eucalyptus wood pulp through a closed-loop solvent process that recovers more than 99% of its production solvent per cycle, according to Lenzing AG's published data. The fiber is not petroleum-derived. Its breathability and moisture management are properties of the fiber structure itself, requiring no chemical finishing to achieve. For a full explanation of what TENCEL Lyocell is and how it is made, the production process tells the full story.
On the shedding question: TENCEL Lyocell, as a natural cellulose fiber, breaks down in the environment in a way that synthetic microplastics do not. The environmental persistence concern that applies to polyester microplastics does not apply in the same way to cellulose fiber particles.
On performance: a 2014 study in Fibers and Polymers by Kaplan et al. confirmed that TENCEL Lyocell maintains superior moisture management versus cotton under active wear conditions. In a comparison with recycled polyester, which manages moisture by repelling it to the surface rather than absorbing it, TENCEL Lyocell performs comparably at moderate intensity and more comfortably at the skin level across a range of workout conditions.
The honest comparison
Recycled polyester is better than virgin polyester on the supply chain measure. It is equivalent to virgin polyester on every in-use measure: microplastic shedding, skin contact with synthetic material, and susceptibility to synthetic chemical finishes.
TENCEL Lyocell addresses both the supply chain question and the in-use questions. The production process is demonstrably lower-impact than synthetic fiber manufacturing. The fiber against your skin during a workout is not petroleum-derived, does not shed persistent synthetic microplastics, and does not require chemical finishes to perform. For those who have already decided recycled polyester is not the full answer, the recycled polyester activewear alternatives cover every option worth considering. And the question of whether recycled polyester is actually safe deserves a direct answer rather than a marketing one.
The choice between them depends on what problem you are trying to solve. If the concern is upstream environmental impact, recycled polyester makes a real difference. If the concern is what is touching your body and entering the environment during use, it does not.
What Bellissima chose and why
The Sempre Leggings are made from 92% TENCEL Lyocell. Recycled polyester was evaluated and passed over because it addressed only the supply chain question while leaving the in-use concerns intact. The goal was a fabric that performed during a workout and did not introduce the same set of synthetic material concerns through the back door.
The question worth sitting with
Recycled polyester is a better version of a conventional choice. TENCEL Lyocell is a different kind of choice. Which one is right depends on what matters most to you, and on having enough information to know what each option actually delivers versus what its marketing suggests.
You now have that information. The rest is a personal decision.
Why this conversation matters more in 2026
In April 2026, the Texas Attorney General opened a civil investigation into Lululemon over the potential presence of PFAS (per- and polyfluoroalkyl substances) in activewear marketed to health-conscious consumers. The brand confirmed PFAS had been used in its durable water repellent products before being phased out in early 2024. A class action lawsuit in California made parallel allegations about misleading sustainability marketing.
The case mattered beyond Lululemon. It confirmed that synthetic fabric chemistry was being scrutinized at the state attorney general level, and that the gap between brand wellness positioning and what is actually in the fabric had become a consumer protection question. California and New York implemented broader PFAS-in-apparel bans in January 2025. Thirty state attorneys general had initiated litigation against PFAS manufacturers by the end of 2024.
What this means for anyone choosing activewear: the fiber content label is not the full picture, and brand claims are not the same as independent third-party certification on the finished textile. Understanding what the base fiber is, and how the finished garment has been verified, is the practical question this category now demands.
Sources
Texas Attorney General. (2026, April 13). Attorney General Ken Paxton Launches Investigation into Lululemon Over Potential Presence of Toxic "Forever Chemicals" in Activewear. texasattorneygeneral.gov.
U.S. Environmental Protection Agency. (2024). Our Current Understanding of the Human Health and Environmental Risks of PFAS. EPA.gov.
Browne, M.A., et al. (2011). Accumulation of microplastic on shorelines worldwide: Sources and sinks. Environmental Science and Technology, 45(21).
Landrigan, P.J., et al. (2021). Microplastics in human blood. Nature Food.
MADE SAFE. (2022). PFAS in activewear: Brand scorecard. MADE SAFE Report.
Kaplan, S., et al. (2014). Thermal comfort of lyocell and other fibers in active wear. Fibers and Polymers, 15(6).
Lenzing AG. (2023). TENCEL Lyocell fiber sustainability data. Lenzing Sustainability Report.