Sockwell Women's Fleur De Plume Knee-Hi Socks 33% merino Wool/33% Bamboo Rayon/29% Nylon/5% Spandex Made in US 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 Spandex throughout the sock prevents slippage and ensures a snappy fit throughout the day Y heel shape for better fit Turn welt top helps keeps the sock in place Y heel shape design for better fit