95% of products that touch your skin are made of plastic.
We review every activewear brand so you don't have to. Only natural fabrics make the cut.
Independent reviews. Fabric science. No greenwashing.
95% of activewear is made from plastic.
Polyester
Petroleum-based. Takes 200+ years to decompose. Sheds microplastics every wash.
PFAS
Hormone-disrupting ‘forever chemicals’ found in major activewear brands. Your skin absorbs them.
Microplastics
A single polyester garment releases 700,000 microplastic fibers per wash. Into your water. Into you.
Your leggings shouldn't be a health risk.
You are wearing plastic.
95% of activewear is made from petroleum byproducts like polyester and nylon. These fabrics shed microplastics directly into our water systems and press against your skin while your pores are wide open during a workout.
Microplastic Release (fibers / wash)
Source: Industry aggregated data (est.)
The Awakening is Happening
We aren't the only ones asking questions. Search volume for non-toxic textiles is exploding. Here are the top concerns driving consumers to clean alternatives.
Top Rising Search Terms
- 1.sustainable activewear brands22,000
- 2.acne from pillowcase18,000
- 3.best non toxic activewear15,000
- 4.plastic free bedding14,500
- 5.pfas in leggings12,000
- 6.organic cotton yoga pants11,000
- 7.dangers of microfiber sheets10,200
- 8.polyester allergy symptoms9,500
- 9.bpa in sports bras8,900
- 10.microplastics in lungs8,200
- 11.tencel vs polyester7,200
- 12.is nylon safe for skin6,700
- 13.hormone disruptors in clothes6,100
- 14.recycled polyester toxicity5,400
- 15.100% merino wool leggings4,500
Consumer Concern Landscape (relative volume)
Synthetic vs. Natural
Why do we ban polyester? It's not just about the planet; it's about performance. Natural fibers like Merino Wool and Tencel manage moisture effectively, whereas plastics trap bacteria and need chemical finishes to “wick” sweat.
Comparing: Breathability, Moisture Wicking, Odor Resistance, Sustainability & Skin Safety.
The Undo Machine
Select a common toxic item to see the ONDU-approved clean swap.
Polyester Leggings
Traps sweat, breeds bacteria, sheds microplastics.
Tencel / Merino Leggings
Naturally wicks sweat, antibacterial, breathable, zero plastic shedding.
Try: Reprise or IcebreakerWhat we curate
Every product is vetted for natural fabrics. No polyester. No nylon. No plastic on your skin.
32+
ONDU Move
Activewear that puts your skin first. Tencel, merino, organic cotton, hemp.
Explore15+
ONDU Sleep
Your pillowcase touches your face for 8 hours. Mulberry silk, organic cotton, linen.
ExploreComing soon
ONDU Beauty
What you put on your skin matters. Natural skincare, coming soon.
Notify mehow toxic is your activewear?
The Label Decoder
Enter the fabric composition from your activewear label. We will tell you exactly what is touching your skin, and whether you should worry.
Decode your labelThe Club
Weekly fabric science, brand investigations, and clean swaps. Opening to 500 founding members.
Hand-picked
Editor's picks
Sports BrasSpaghetti Strap Cotton Sports Bra (6-Pack)
Lightweight cotton-blend sports bras for everyday wear and low-impact activities. 6-pack value.
PillowsmyTravel Pillow
Compact wool-filled travel pillow. Naturally hypoallergenic, temperature-regulating, and moisture-wicking for restful sleep on the go.
JoggersGOTS Organic Cotton Heavyweight Sweatpants
GOTS-certified organic cotton heavyweight relaxed-fit sweatpants. Sustainable and seriously comfortable.
PillowsmyWoolly Pillow
Premium pillow filled with Shropshire wool "Woolly Puffs" in a 300TC natural cotton sateen shell. Adjustable loft, naturally temperature-regulating.
the story behind the curation
We started ONDU because we were pissed off.
95% of activewear is made from plastic. The industry calls it “performance fabric.” We call it petroleum on your skin. ONDU is the filter between you and an industry that puts profit over your pores.
Read our story
Know Your Fabric
Not all “sustainable” fabrics are equal. Here's what actually matters.