A lightweight quarter sock with a moisture managing Olefin liner combined with a soft Merino wool outer sock to prevent chafing and discomfort. Features: INGenius is a liner sock and outer sock knit together as one unit Improved moisture movement, insulation, blister suppression and comfort 1x1 rib rolled welt top and 3x1 elasticized rib leg Nylon-reinforced heel and toe, ultra-smooth Lin toe closure Pique mesh panels at the toe and shin for breathability SM = ladies shoe size 4-7 or up to mens shoe size 5 MD = ladies shoe size 6-10 or mens size 5-9.5 LG = ladies shoe size 10-13 or mens size 9-12 XL = mens size 12-15