These are made of Patchwork from scrap materials. I'm not sure what the content of the fabric is I believe it's a polyester spandex blend but it is extremely soft. You can wear these inside or outside some people like to have the seams on the outside for more texture. These are really comfortable alone or layered over tights and they fit a size 8 to 9 best the model is a size 7 and 1/2 but the socks are quite loose.