The Aetrex Compression Sock with Copper Sole Technology is unmatched in comfort, performance, and protection. The lab tested and clinically proven Copper Sole Technology prevents bacteria, fungi, odor and improves skin texture and appearance. It has a graduated compression from ankle to knee (20-25mmHg) and has hand-linked flat toe seams. Compression socks reduces swelling and leg fatigue and are recommended for varicose veins, swollen legs, post-surgery, and moderate edema. Medium fits about a women's shoe size 7 to 10 and the large is for above a size 10.