These underwear are made of 95% organic cotton and 5% spandex unless otherwise noted. It is recommended that you size up as these run a bit small.
Hemp/Organic Cotton/Spandex underwear are 52% hemp, 43% organic cotton, and 5% spandex
Purple Geos are 95% standard cotton and 5% spandex
* denotes standard cotton spandex body and organic cotton spandex bands
** denotes Midweight wool 95% wool 5% spandex
**** indicates that the fabric is very stretchy so you should size down. For example if it is listed as a size 6, it would fit someone who wears a size 8.