WOOLIGAN uses TurboWool but is knitted to be much thicker. That means when it's very cold you'll stay very WARM. Made from ISOLWOOL®-- a superior blend of 50% Merino WOOL and 50% polypropylene. This blend is 5 times the strength and durability of Merino wool alone. Shrink-resistant and itch-free their Wool socks will keep your feet drier and provide excellent insulation in all weather conditions. Their Wool socks also feature our "Easy-Fit" cuff and "Stretch-to-Fit" sizing system for maximum fit and performance. Their WOOL socks out-wick and evaporate moisture better than any other wool sock on the market today.