Memoi Ribbed Opaque Tights, model MK-209. These are not cotton, they're a microfiber material 90% Nylon and 10% Spandex and they're about 50 denier. They have a fine rib. This product runs small, similar to the Memoi Winter Opaque Tights Model MK-208. They seem to last better than the MK-208 because the ribbed area is thicker. These Memoi tights come in children's sizes and women's sizes. They don't have control top. For the girl's sizes go to the Girl's section of the website.