Sockwell Women Ascend Crew Compression Socks 41% Merino Wool, 41% Nylon, 14% Alpaca, 4% Spandex Made in US Moderate (15-20mmhg) graduated compression recommended for Biking, Hiking, Walking, and Running. Minimizes swelling of the feet and ankles. Perfect for flight travel, and when you are on your feet for long periods of time. Promotes circulation, minimizes swelling, and helps reduce fatigue- Perfect for Work, Sports, Running. Improve your performance and stamina with the best fitting compression sock on the market. Low profile design still Promotes circulation, minimizes swelling, and helps reduce fatigue Size Small/Medium fits US shoe size 4  7.5, Size Medium/Large fits US shoe size 8  11. Medium cushion sole provides comfort and has a Non-abrasive Seamless Toe closure. Offers arch support, turn welt top and seamless toe closure with reinforced Toe and Heel Box helps keep the sock in place throughout the day