Women's Thermal Base Layer
Women's Cotton Thermal Underwear & Base Layers
Most thermal clothing is polyester or a synthetic blend, worn tight against the skin for a whole winter's day. These are knit from 100% GOTS-certified organic cotton instead — no natural rubber latex, no spandex, and no chemical finishes between you and the cold.
Made for women managing eczema, contact dermatitis, latex or elastic sensitivities, and chemical sensitivities — and for anyone whose skin reacts to synthetic base layers but still needs the warmth.
Styles in this collection
- Long-sleeve thermal tops — a cotton base layer tee made to wear under a jumper or shirt.
- Thermal bottoms — a full-length cotton base layer to wear under trousers when the temperature drops.
Free from
- Natural rubber latex, rubber accelerators & spandex
- Formaldehyde & formaldehyde-releasing finishes
- Synthetic dyes and harsh chemical treatments
- PFAS and other “forever chemicals”
Trusted, tested, certified
- GOTS-certified organic cotton
- OEKO-TEX® Standard 100 thread
- MyMicrobiome textile-certified for skin-microbiome compatibility
- Sewn in our own GOTS- and B-Corp-certified factory
Layering for winter? Pair these with our organic cotton leggings and elastic-free cotton socks, or browse the full women's collection.
