Sockwell Women's Shadow Dot Graduated Compression Socks 31% Merino Wool, 31% Bamboo Rayon, 30% Stretch Nylon, 8% Spandex Made in US Firm(20-30mmHg) Graduated Compression-Recommended for: All day and every day wear, helpful for those who are, Flying and Traveling, Prolonged sitting or standing, Exercise and recovery Minimizes or eliminates swelling of the feet. Reduces Foot Fatigue Promotes circulation, minimizes swelling, and helps reduce fatigue- Perfect for Nurses, Pregnant Mommies, Sports, Running. Improve your performance and stamina with the best fitting compression sock on the market. Accu-fit technology consisting of spandex throughout the sock ensures same fit at the end of the day as when it was first pulled on Light cushion sole provides comfort and has a Non-abrasive Seamless Toe closure. Size Small/Medium fits US shoe size 4  7.5, Size Medium/Large fits US shoe size 8 - 11 Offers 4 zones of graduated compression, arch support, with reinforced Toe and Heel Box which helps keep the sock in place throughout the day