Allegro Nylon Blend Support Socks are made of lightweight ribbed nylon/spandex fabric that comes to just below the knee. It has a non-binding top so the socks stay up on their own and features a “comfort” heel and balloon toe. Superlative compression hosiery does not have to be expensive -- the Allegro brand provides quality comfort and support identical to the famous brands that cost two to three times more. This stocking provides 20-25mmHg of gradient compression and helps improve blood flow, prevent edema (swelling), and reduce the discomfort caused by moderate varicose veins. Woven from 90% nylon and 10% spandex in the USA.