Material: 75% nylon, 25% Spandex. Cushioned toe and sole beds for last use and shock absorption. There is enough flexible texture for stretching to fit comfortably. Similar to varicose veins stockings, tights, pantyhose and leggings, this compression socks help with prevention and formation of varicose and spider veins. 15-20 mmHg gradual moderate compression, targeted compression zones provide varying levels of support from moderate to extra firm. Help relieve pain. Each pair of socks includes a strong high quality built-in zipper to secure a snug fit. It prevents unzipping even during movement all day long. Easy to take on and take off. Your satisfaction is our topmost priority. If you do not like our socks for any reason, we offer a full refund or free replacement. No questions asked.