Therafirm Men's Light Ribbed Support Socks are designed to improve circulation, relieve tired, heavy, aching legs, prevent light swelling and other conditions as physician recommended. True gradient compression delivers a controlled amount of pressure greatest at the ankle and gradually decreases towards the top of the stocking to promote better blood flow.Therafirm Men's Light Ribbed Support Socks Feature:10-15mmHg (the mean compression for an average ankle size)Soft comfort band is non-restrictive while staying in place all dayComfort toe and heelTwo-way stretch nylon and spandexHand wash in lukewarm or cold water with mild detergent. Avoid prolonged exposure to heat.Made in the USAGradient compression hosiery is constructed differently than traditional hosiery. Those who have never worn gradient compression before may feel that these garments are difficult to put on or tighter than traditional hosiery. It is this snug fit that provides the graduated pressure. It is very important to measure the ankle, calf, and sometimes thigh to ensure a proper fit and to receive the benefits of the graduated compression.Be sure to use the size chart and measuring instructions to determine best size and fit.