Men's Mid-Liner No-Show Sock. Mephisto socks are crafted of the most luxuries 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 sizes 7 - 10, LRG = Men's shoe sizes 10 1/2 - 13.