Byford's famous Byflex Sock is a 6 x 3 Rib Solid made of 65% Merino Wool, 33% Nylon, and 2% Lycra. Also available in Anklet. BY5102$14.50 Color: Khaki Heather(11)Brown Heather(21)Taupe Heather(22)Charcoal(30)Navy(40)Olive Heather(61)Black(90)