15-20 mmHg Thigh Thigh Compression Stockings for spider veins, varicose veins, swelling, leg pain, Rest Leg syndrome, post-surgery, travel, standing and sitting for long periods, and overall leg health. Compression therapy works by fighting gravities natural forces on your body. Graduated compression stockings squeeze tightest at the lowest point (ankle) in your legs, and gradually lessen as the stockings go up the leg. This increases the velocity of blood flow back to your heart by aiding the calf muscle to pump (squeeze) the vein walls to move blood vertically.