The sock features firm support to promote better circulation and relieve fatigue due to medical aliments. The top is on binding comport and firm compression at the ankle gradually decreases towards the calf to promote circulation. The heel and toe are non-restricting for superior fit and comfort with firm compression to support the arch with a compression range of 20-30 mmHg. Clinically proven and physician recommended to relieve tired, aching and swollen legs, often symptoms of varicose veins. Superior "stay up" performance. Instructions for best way to put them on included. Made in the USA. Made in the USA. Gradual compression firm arch to ankle decreases toward calf. Medically proven graduated compression. Compression range 20-30 mmHg. Non-binding comfort top.