Circulating blood is subjected to gravity. On standing up, blood is redistributed to regions below the heart, and venous return to the heart may be reduced. Compression socks apply pressure to your lower legs. This can help to increase blood flow and boost circulation, which can be especially helpful if you have venous insufficiency. Compression socks and stockings are designed for compression therapy. They apply gentle pressure to your legs and ankles, promoting blood flow from your legs to your heart. Compression socks can also reduce pain and swelling in your ankles and legs.