Dahlgren Multipass Socks Toe, Heel, Wicking Channels: 55% Merino Wool, 27% Nylon, 18% Alpaca Body: 75% Polyester, 23% Nylon, 2% Spandex Made in US Alpaca/Merino wool in wicking channels absorbs moisture; ThermaDri Hydrophobic transfers moisture out of sock keeping feet drier, more comfortable Moderate cushion throughout sock for greater comfort New ventilating mesh in leg Patented Dri-Stride System Therma-Dri in transfer & evaporation zones