Spacer Mobility Reb Club Socks integrate form, function, and style to elevate your every step, stride, or jump. Size Guide:S: US Men 4-5.5 US Women 6-7.5, EU 35-37.5M: US Men 6-8.5, US Women 8-10.5, EU 38-41.5L: US Men 9-12.5, US Women 11-13.5, EU 42-46 XL: US Men 13-17, US Women 14-15.5, EU 46.5-49 Material: 69% combed cotton, 17% polyester, 11% nylon, 3% elastine. The perfect sock for all your training needs: running, lifting, hiking or lounging at home.  Recommendation: The gripped style is designed to be worn in the gym when lifting without shoes, at home or at work. You can also hide your toe spacers under them. Returns and Exchanges For health and hygiene reasons some products are not able to be returned for incorrect sizing or change of mind. This includes Toe Spacers, Rock Mat and all socks.