The ability of cotton to breathe and absorb moisture, coupled with lycra's super stretch, makes this a very comfortable sock with minimal sagging. A classic smooth-weave knee-high. Made of 70% cotton/25% nylon/5% spandex. When choosing your size, keep in mind that size 9-11 are for ladies with slender legs and or shorter stature and 10-13 are for average to larger sized ladies or ladies with longer legs. These socks fit snugly and they will not fall down as you wear them.