Women's natural fiber activewear

Almost none of it is fully plastic-free, because elastane is what makes a legging hold its shape. Merino wool base layers come closest, and organic cotton works for lower-intensity movement. Toxome shows the synthetic percentage rather than pretending the category is cleaner than it is.

Merino moves moisture, regulates temperature in heat and cold, and resists odor naturally because of how the fiber handles bacteria. It does the job polyester was engineered to do, without the plastic, which is why it dominates the natural fiber end of this category.

Toxome reads each garment's fiber composition and scores it on what that fiber does to your body, not on a brand's sustainability marketing. A higher score means a cleaner fiber. Composition is taken from what the brand publishes, so the score reflects the label, not our opinion of it.