Cotton/polyester socks with ceramic fibres. Adds comfort and additional insulation. Small: 35-38 Medium: 39-42 Large: 43-47. Great for people with Diabetes! Our socks have generated remarkable feedback from users. People have a lot of trouble with their feet, which to a large extent, is caused by inflammation, pain, or poor circulation. Our socks are comfortable to wear throughout the day or even while asleep. As the fabric reflects more heat when you are moving around, it is wise to get accustomed to the product during your active daylight hours. Once you are comfortable with the effect or sensation generated by the ceramic fabric, you can choose to wear them throughout the night as well.