Sockwell Women's Twister Graduated Compression Socks 33% Merino Wool, 33% Bamboo Rayon, 28% Nylon, 6% 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. Sock length fits over the Calf of your leg. 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. Size Small/Medium fits US shoe size 4  7.5, Size Medium/Large fits US shoe size 8  11. Light cushion sole provides comfort and has a Non-abrasive Seamless Toe closure. Offers 4 zones of graduated compression starting at the ankle and moves up the leg which keeps your toes comfortable without feeling any pressure