Sockwell Pulse 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. Firm 20-30mmHG compression promotes circulation, minimizes swelling and reduces fatigue. Features arch support and a breather panel for extra comfort. Great for prolonged sitting or standing, flying, travel and exercise.Firm Graduated compression leg; 20-30mmHGUltra-light Cushion SoleSeamless Toe ClosureSku: SW42M-850