Sockwell Sprint compression sock is crafted in the USA of fine merino wool and rayon from bamboo with spandex throughout the sock for superior fit and comfort. 15-20mmHG compression promotes circulation, minimizes swelling and reduces fatigue. Great for prolonged sitting or standing, flying, travel and exercise.Graduated compression leg; 15-20mmHGUltra-light Cushion SoleSeamless Toe ClosureSku: SW106M-805