Firm Support, Men’s Socks,1 Pair Made in USA. Certified medical grade compression garment. Approved for Class II Gradient Compression Therapy. Microfibers create a yarn that is soft, lightweight and durable. These socks are crafted of a special blend of microfiber, cotton and Spandex giving the stretchable material a soft supple feel. 20-30 mmHg Compression helps prevent and treat: varicose veins and spider veins, edema, blood clots and DVT. It is effective in relieving fatigue, pain, stiffness, soreness, swelling and cramps. PERFECT FIT: JOMI is a Medical Quality Brand, commonly purchased in surgical supply stores where they are professionally fitted. To fit them yourself we have provided detailed instructions. Please see sizing instructions in the Images section.