4 brands in North America selling underwear, with the fibre read on every style so you can see which are natural and which blend in polyester.

Underwear clothing brands that are sustainable, practise ethical fashion and are organic and non toxic. Check every Underwear clothing brand for the composition, full catalogues, the organic and natural material percentage, the sourcing transparency score, the supplier disclosure and traceability, any PFAS or toxic findings, the sourcing red flags and where to buy. Use the free fibre checker and greenwash checker to test any Underwear clothing brand before you buy.