Sockwell Women's Ski Ultra-Light Compression Socks 42% Nylon, 36% Merino Wool. 11% Alpaca, 6% Rayon From Bamboo, 5% Spandex Made in US Moderate (15-20mmhg) graduated compression recommended for everyday wear for prolonged sitting- standing- travel- minimizes swelling of the feet- legs Offers arch support, turn welt top, breather mesh panels and Seamless toe closure with reinforced toe and heel box helps keep the sock in place 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 Promotes circulation, minimizes swelling, and helps reduce fatigue Alpaca blend adds additional durability and thermoregulation and ultra-light cushion sole provides comfort and great fit