It’s pretty difficult to find 100% organic cotton undies, but more likely conventional cotton. If you use undies with nylon or polyester, just wash them in a microplastic catcher.
Thunderpants uses fair trade organic cotton and works with growers in India for the yarn, but also with domestci workers in northern England, for production and making cotton drill. Fabric scraps are used to make cleaning cloths and they use unbleached brown card and water-based black ink for packaging.
YOU Underwear is made with fair trade organic cotton and made ethically. Sent in biodegradable and recycled packaging, they donate two pairs for each pair you buy. You can also recycle your underwear through their partnership with Terracycle.
Arlo Hudson makes mens’ underwear from a blend of Tencel and a little elastane. The boxers have horizontal fly design with no-roll leg binding for perfect fit without adjustments, and the fabric lets you stay cool all day and night. 5 times softer than cotton, it’s also naturally antibacterial with a tag-free waistband for ultimate comfort. Sustainably made in Portugal.