WOMEN'S : 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 system when worn with Mephisto Footwear. 35% Nylon, 30% Rayon from Bamboo, 30% Merino Wool, 5% Spandex. SIZING: SM=Women's shoe sizes 4 - 7 1/2, ML=Women's shoe sizes 8 - 10 1/2