Covidien TED - Anti-embolism Knee High 8-18mmHg Compression Stockings are anti-em support stockings that help to prevent thromboembolism, also known as blood clots. These stockings provide 8-18mmHg of moderate compression. These knee high nylon support hose feature a full foot and closed toe. These compression stockings are available in a variety of colors and sizes and provide a comfortable solution to preventing thromboembolism. Sizes: small, medium, large, x-large (regular and long styles). Sold by the pair.