Memoi Girls Ribbed Opaque Tights, Model MK-209. These are not cotton, they're a microfiber material 90% Nylon and 10% Spandex. They have a fine rib. This product runs small, similar to the Memoi Girls Winter Opaque Tights Model MK-208. They seem to last better than the MK-208 because the ribbed area is thicker. These come in small children's sizes and large grown up sizes. They don't have control top. Great for school or for fancy events.