Fibers that often score better in underwear
These score better on microplastics, biodegradability, or shedding when they make up most of the garment. A preferred fiber is not a skin-safety claim.
- Organic CottonThe everyday higher-scoring choice for briefs, boxers, and undies when the blend is not mostly synthetic.
- ModalA wood-pulp knit that shows up in a lot of softer underwear and usually sheds less than polyester.
- Tencel LyocellAnother wood-pulp fiber used in underwear knits. Not cotton, and usually a better shedding profile than nylon.
- HempA plant bast fiber. Less common in underwear, but it does not shed plastic fibers.
- SilkAn animal protein fiber used in some underwear. Not a microplastic source in MaterialsDB; still check dyes and finishes on the listing.