The Best Non-Toxic & Natural-Fiber Activewear of 2026
Most of the activewear we know and love — like Lululemon and Alo — is made from polyester and nylon.
But activewear has come under scrutiny lately, with emerging research suggesting chemicals used in fabric production - like PFAS and BPA - may transfer more easily from fabric to skin when we sweat.
I couldn’t help but wonder… can natural-fiber activewear be just as sculpting, stretchy, and high-performing as our Lululemons?
I asked women online which “non-toxic” activewear was actually worth trying. 600+ comments later, I put 13 of the most-recommended brands through real, very sweaty workouts.
Here’s what was actually worth it.
Reprise
The closest natural-fiber alternative I found to Lululemon Align.
It felt like a true workhorse basic: soft and comfortable, but substantial enough to hold you in. This is one I’ve actually kept reaching for.
Indigo Luna
The surprise winner for sweaty workouts — buttery-soft, fully covered, and somehow showed basically no sweat.
I wore this to a heated class expecting the soft fabric to show everything, and it didn’t. It’s incredibly comfortable and loungey, though the cami has no built-in support, so I’d wear a sports bra underneath if you are larger chested or for anything high impact
PS Active
Holy perfection?
The moment I put this on, I felt like a certified baddie. The cuts and fit felt right on par with a CSB / Alo, especially the top which I found to be both supportive and giving you shape while being super comfortable. This may be my favorite activewear top I’ve ever tried….dare I say..ever? If your biggest fear with natural fiber is looking frumpy - Olessa is your answer.
Olessa
The most sculpting and fashion-forward option I tested — closest to Alo, SET Active and 437.
The moment I put this on, I felt like a certified baddie. The cuts and fit felt right on par with a CSB / Alo, especially the top which I found to be both supportive and giving you shape while being super comfortable. This may be my favorite activewear top I’ve ever tried….dare I say..ever? If your biggest fear with natural fiber is looking frumpy - Olessa is your answer.
Layere
The closest thing I found to Beyond Yoga — cute colors, styles, and max comfort for lower-impact days.
I loved the styles and cute colors. This is the set I keep grabbing for girls trips when I know we’ll be doing a hot girl walk - perfect for taking barre or pilates class and then running errands or lounging.
You do trade softness for sculpting. Not my first pick for a heated sculpt or HIIT workout given the heavier cotton fabric that does show through sweat.
Other Brands to Consider
Definite Articles
Definite Articles isn’t a natural-fiber pick—it’s made of polyester and nylon. What makes it different is that the brand independently tests every finished garment for PFAS, BPA, and 50+ other substances. For high-intensity workouts (like Barry’s Bootcamp) where I want traditional activewear performance, it’s the strongest option I tested.
MATE
The best organic-cotton option I tested — supportive, flattering, and substantial without feeling restrictive.
Pact
Pact is one of the easiest, most affordable ways to try organic-cotton activewear. It’s a genuinely good entry point for low-impact workouts if you want more natural fibers without spending a lot.
Lezat
Lezat sits somewhere between Pact and MATE for me. Compared to Pact, It has more design options, but is less squat-proof. It’s less expensive than MATE, but I found the MATE fabric to be slightly more comfortable and squat-proof.
The Rest I Tested
These are the other activewear brands I personally tested that didn’t make my recommended picks.
Wildbody
The organic-cotton fabric felt more restrictive than the other cotton options I tested. I didn’t find it particularly comfortable.
Estroni
Of the two merino-wool options I tested, Estroni felt better suited to an actual workout. But the fabric still had a slight itchiness to it, and given the price, I preferred the feel and performance of the other fabrics above.
Don Kaka
Don Kaka’s merino-wool set felt more like elevated loungewear than true activewear to me. It could work for very low-impact movement, but it was slightly itchy and not something I’d personally choose for a workout.
Pinky & Kamal
Pinky & Kamal’s was exceptionally soft and comfortable (bamboo, organic cotton, spandex blend) - almost pajama-like. But it was also the sheerest set I tested when in a full squat, which made it hard for me to recommend for workouts involving squats or bending. The styles feel more purpose-built for yoga.
Live the Process
Live the Process was the only 100% organic-cotton option I tested, with no elastane for stretch or hold. In practice, that meant the bottoms had trouble staying up, and the fabric became heavy and uncomfortable once wet.
Final thoughts
After testing all of these sets, my biggest takeaway is that natural-fiber activewear is much more viable than I expected—but there’s still no perfect replacement for every synthetic workout set.
The few sets that seemed to do it all - were very expensive. The sets that are more affordable have some clear drawbacks.
What I can tell you - this is a product category that is about to explode and I anticipate we’ll see a lot more innovation around. There are already 4-5 brands that have crossed my desk for part 2 - so stay tuned and subscribe for the next report!