Graduated Compression Socks for Improved Circulation. 15-20 mmHg. Shoe Size: 6.5 - 8.5. The actual color of this pair of socks does not match the color reflected on the cover of the box. These socks are Onyx (gray) argyle. Best suited for management of early stage clinic venous disease. Perfect for long distance travel and fashionable options. Knee high, calf grip top made of 100% microfiber. Excellent breathability and moisture management. Easy to put on and take off with non-binding top band. These socks are sealed for hygienic purposes.