Firm compression or 20-30mmHg hosiery and stockings are designed to help individuals who experience more serious leg discomforts such as moderate swelling and leg pain while also aid in the treatment of medium- severity varicose veins. This level of compression is also useful for post-surgical vein stripping, sclerotherapy, help reduce the risk of Deep Vein Thrombosis (DVT), venous ulcerations and provide treatment for mild lymphedema. Firm compression is available in socks, knee-highs, thigh-highs and pantyhose. 20-30mmHg is considered the first stage of Medical Compression. That means a prescription from a physician for this product is highly recommended for your health and safety.