Sockwell Women's Go To Knee-Hi Socks 43% Merino Wool/28% Stretch Nylon/20% Alpaca/5% Rayon/4% Spandex Made in US Spandex throughout the sock ensures an uncompromising fit from the beginning to the end of the day Ultra flat toe seam for superior in shoe comfort Alpaca and wool yarns provide unmatched natural thermoregulation and moisture management