Pearl Izumi Elite Thermal Wool Sock Small Shadow GreyThe Pearl Izumi Elite Thermal Wool Sock is designed to keep up with your coldest training conditions. The Merino wool thoroughly insulates the heel and toes while the flat toe seam construction helps to eliminate bunching. There is strategic cushioning under the foot and anatomic arch compression to maximize the blood flow efficiency during your extreme weather training. Available in Black and Shadow Grey.888687047767