Wigwam F2595 Silver Wl Walker Grey, MD 2% spandex SmartSilver keeps feet odor free and feeling freshSeamless toe closure Soft Merino wool throughout47% Stretch Nylon, 45% Merino Wool, 7% Dri-Release, 2% Spandex Cushiony soleMedium fits Men's shoe size 5-9.5 and Women's shoe size 6-10 Foot hugging fitLarge fits Men's shoe size 9-12 and Women's shoe size 10-13 Long wearing foot bottomXlarge fits Men's shoe size 12-15