Coolmax Style 120, over-the-calf white, Style 150 over-the-calf black, Style 125, over-the-calf khaki. Our firm compression Coolmax Knee Hi Sock, made from 65% Coolmax, 9% Lycra, and 26% Nylon, gives you a new level of comfort in a support sock, at a terrific price. This sock is ideal for casual wear, as it has medically approved 20-30 support, to aid those aching legs, while it gives the advanced moisture transport of Coolmax, so your feet stay dry and comfortable. It is thicker than a standard nylon/lycra sock, with additional thickness around the entire foot area, giving a new level of comfort in a support sock. Ideal for athletics, walking shoes, golf and any casual or sporting activity. The thickness is about that of an athletic sock, so no need to worry about larger sized shoes. 20-30 support is generally referred to as Firm or Extra Firm, and this sock can be used as a replacement for any 20 compression support sock, or as a replacement for TED's. Order by Shoe Size. Men: Small - 7&under; Med - 7 1/2-10, Large -10 1/2- 12 1/2, XLarge - 13 and over.