Jobst Opaque - Women's Full Calf Knee High 20-30mmHg Compression Stockings are closed toe with a reinforced toe and heel for durability. They are made from an opaque nylon and spandex blend that also incorporates silicone, making them breathable and comfortable. The firm gradient compression is ideal for moderate to severe varicose veins, leg and ankle swelling, as well as moderate edema and lymphedema. These compression socks also help prevent deep vein thrombosis, known as DVT.