Set Active has built a significant following on the back of matching sets, muted colorways, and a strong social media presence. The brand has positioned itself at the intersection of aesthetic and function, at a price point that sits below premium labels like Alo and Lululemon. What it has not built, at least publicly, is a narrative around chemical transparency.
For buyers who are thinking about what is in their activewear, not just what it looks like, that gap is worth examining. The framework for evaluating it starts with shop non toxic activewear built on independently verified fiber and finishing chemistry rather than aesthetic positioning alone.
What Set Active Is Made Of
Set Active's products are primarily constructed from nylon and spandex blends. These are synthetic polymers engineered for stretch, shape retention, and color vibrancy. The performance characteristics of nylon-spandex fabrics can come from the fiber structure itself, from chemical finishing, or from a combination of both.
The brand does not prominently publish fabric finishing information on its product pages. Fabric composition is listed, but the question of whether performance finishes, including water resistance or moisture management treatments, have been applied to the fabric is not addressed in publicly available product documentation.
Certification: What Is and Is Not Publicly Available
As of the most recent publicly available information, Set Active does not list OEKO-TEX Standard 100 certification, bluesign certification, or other independent chemical transparency credentials on its product pages or in its publicly accessible brand documentation.
OEKO-TEX Standard 100 is relevant here because it tests finished products for a defined list of harmful substances, including PFAS compounds, heavy metals, formaldehyde, and pesticide residues. A brand that holds this certification has had its finished garments independently tested against those criteria. A brand without it has not, at least not in a way that is publicly verifiable. The non-toxic activewear buying guide explains how to use certification as a decision filter across any brand.
Why This Matters More for Trend-Driven Brands
Brands that move fast on color and design often source fabrics from mills that prioritize speed and aesthetic output. The chemical finishing processes used to achieve specific colors, textures, and performance properties in fast-moving fabric supply chains are not always subject to the same scrutiny as those used by brands with published sustainability frameworks.
Research published in Environmental Science and Technology Letters has documented PFAS migration from synthetic textiles during wear, particularly in conditions involving heat and perspiration. Activewear, worn during exercise, is precisely the context where this migration is most relevant. How this plays out at the industry level is covered in whether Lululemon is non-toxic in 2026 and at a wellness-positioned brand in whether Alo Yoga is non-toxic.
This does not mean Set Active garments contain PFAS. It means the public record does not confirm what is or is not present in the finished product at a chemical level.
The Aesthetic Wellness Gap
There is a pattern in this product category worth naming directly. Brands that position around wellness aesthetics, soft tones, matching sets, and a lifestyle that implies health, do not always close the loop on what their products are actually made of at a chemical level. The aesthetic communicates wellness. The supply chain may or may not reflect it.
This is not unique to Set Active. It is a widespread gap in the activewear market. But it is more pronounced in brands where the visual identity leans heavily into wellness associations without the certification infrastructure to back them up. The category-wide picture is covered in the research on toxic chemicals in workout clothes and in the Public Rec PFAS analysis, which applies the same framework to a comparable brand.
What a Different Starting Point Looks Like
The Sempre Leggings are made from 92% TENCEL Lyocell and 8% spandex. TENCEL Lyocell is produced by Lenzing AG using a closed-loop manufacturing process, and the fiber carries OEKO-TEX certification at the fiber level. There are no added surface finishes on the fabric. The performance properties come from the physical structure of the fiber, not from applied chemistry.
That is a verifiable starting point. The certification number exists and can be looked up. The manufacturing process is documented. The fiber origin is traceable.
The Honest Assessment
Set Active makes attractive, well-priced activewear with a strong aesthetic point of view. The product quality is consistent with its price point. The gap in the public record is chemical transparency. There is no publicly available independent certification confirming the finished product's chemical profile.
If you are buying Set Active because you like the way it looks and the price works for you, that is a reasonable decision. If you are buying it because you believe it is better for your body than synthetic alternatives, the public record does not support that conclusion either way. You are buying on trust, not verified data.
Sources
- Kotthoff, M., et al. (2015). Perfluoroalkyl and polyfluoroalkyl substances in consumer products. Environmental Science and Pollution Research.
- OEKO-TEX Association. (2024). OEKO-TEX Standard 100 Public Certification Database. oeko-tex.com.
- Lenzing AG. (2024). TENCEL Lyocell Fiber Certification and Traceability. lenzing.com.
