Therafirm Women's Ribbed Dress Support Socks improve circulation, relieve tired, heavy, aching legs and prevent mild swelling, leg discomfort and deep vein thrombosis (DVT). 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. Made in USA. Features: 15-20 mmHg graduated compression Non-restrictive soft band maintains sock position Comfort toe and heel Nylon, spandex blend Micro-Cool process wicks moisture, keeping skin cool Hand wash in lukewarm or cold water with mild detergent. Avoid prolonged exposure to heat. Material made of: Nylon Spandex