Natural Fiber Workout Clothes
BRANWYN’s natural fiber workout clothes are made from seamless Merino wool, an active fiber. Our underwear, bras, and leggings are naturally sweat-wicking, temperature-regulating, and breathable to help keep you comfortable throughout your workout. Feel confident sweating in our OEKO-TEX® certified, BPAs and PFAs free ZQ+ Merino wool activewear.
Seamless Merino Wool Sports Bras
Seamless Merino Wool Leggings
Sweat Wicking Underwear
The Best Natural Fiber Sports Bra
"The Essential Racerback Sports Bra is probably the heaviest-duty bra on my list. It’s compressive in a good way, making it ideal for high-impact movement that inspires a healthy amount of sweat. It’s true that merino is breathable and quick-drying, and it doesn’t itch or cling — which, for wool, is the whole battle."
- Katie Stone for The Strategist, New York Magazine, “I Tried All the Non-Synthetic Activewear I Could Find”
Sustainable Activewear
"These seamless Essential Compressive Leggings fit more like a tight pair, yet they are extremely thick–When wearing this set, you feel unstoppable, like you could do any activity and still feel supported. It’s also comforting knowing there are no harmful chemicals."
- Courtney Jay Higgins for The Good Trade, "I Tried The Best Sustainable Activewear Brands For 2026"
Natural Fiber Activewear FAQ
Natural fibers are plant- or animal-based materials, including Merino wool, Cotton, Silk, Linen, Hemp, and Alpaca.
Natural fiber activewear offers a nontoxic alternative to synthetic activewear. Choosing natural fibers can help reduce your use of petroleum-based synthetic fabrics, which can shed microplastics and leach harmful chemicals like BPAs during washing and wear.
Merino wool is an active fiber uniquely designed to adapt to changing temperatures and moisture. Its naturally breathable, temperature-regulating, and moisture-absorbing properties help keep you comfortable and dry as you move.
Unlike other natural fibers like cotton that hold onto moisture, Merino’s moisture-wicking and breathable qualities make it an excellent choice for workout clothing. It’s also naturally odor-resistant, helping Merino activewear stay fresher between washes, even after a sweaty workout.
BRANWYN’s natural fiber activewear provides performance that rivals synthetic activewear. Our seamless construction and 4-way stretch allow you to move, jump, run, and stretch freely without feeling restricted. Made with ZQ+ Merino wool, our workout clothes are naturally moisture-wicking, breathable, temperature-regulating, and odor-resistant to help keep you comfortable while you move.