Mephisto socks are crafted of the most luxurious materials, including superfine Merino wool, to provide natural temperature control and moisture management. These socks are designed to create the perfect walking experience when worn with Mephisto Footwear. Sizing: MED: Men's shoe size 7-10; LG: Men's shoe size 10.5-13; SM: Women's 4-7.5, MED: Women's 8-11.