We get it. Polyester is a four letter word these days.
The Coq Classics are made of bamboo viscose fabric. Our waistband, which is stretchy and form fitting, is made of spandex. This is necessary to achieve the elastic effect found in almost every underwear waistband on the market.
Unless the underwear has a button fly, it is not 100% cotton. Anyone selling you a "100% natural" product with elastic stretching capabilities is lying to you. We make it clear right on the pair what material is in our underwear (96% bamboo, 4% spandex) because we're not going to lie just to ride a trend.