Material: 52% cotton,21% nylon,25% polyester,2% spandex. Size: Our running tab socks are available in SMALL: Fit Women Shoe Size 4-7. MEDIUM: Fit Women Shoe Size 7.5-9.5 / Men Shoe Size 6-7.5. LARGE: Fit Women Shoe Size 9.5-11.5 /Men Shoe Size 7.5-9. X-LARGE: Fit Women Shoe Size 11-13 /Men Shoe Size 9-12. These comfortable socks are designed to provide the perfect level of lightweight breathable,keeping your feet and legs cool and dry during running/camping/climbing. Soft And Comfortable:It’s perfect for you to go running,walking,cycling and etc. They have a low rise top cuff, softly strctured heel, and top-seam toe. The cuff is stretchy ribbed half-inch fold over that keeps the socks in place no matter how active you are while wearing our running socks. High Quality:A good deal of needles thread count that provides wonderful compression all day long. And the unique arch support system provides a safe and stable fit, keep your feet comfortable all the time while you wearing our no show running socks. Functions:Designed with anti-slip silica gel to ensure not slide off when you wear with them.And made of breathable material with superior cotton, keeps your feet dry and comfortable all the time.Keep you happy all day long as well. A Good Match:The men’s low cut ankle socks are wonderful matching with your favorite deck shoes, running shoes, athletic shoes, casual shoes and etc.