Pure cotton (other than the elastane) stretch knit denim fabric in a matte, slightly olive-toned grey colour. Fabric does have a "right" side, although you could use either side as you wish. Fabric has some structure to it and a little drape. It feels quite cottony and comfortable, with a somewhat dry hand-feel. Fully opaque. Suitable for bottoms such as women's "leggings pants" or shorts, thicker shirts or shirt-jackets, overalls, kids wear, etc.
Take note that the stretch in this fabric is greater in the length-wise direction, so it is probably meant to be cut cross-grain (similar to bengaline).