Abstract: A knit sock, especially for jogging or other athletic activity, has a foot portion which includes an inner ply having a first inner surface formed to make relatively high frictional contact with the skin of the wearer and a second, outer surface having relatively low frictional characteristics. The inner ply is inserted within and fixed to an outer ply which includes a first inner surface having relatively low frictional characteristics disposed adjacent said second surface of said first ply and a second, outer surface having a relatively high frictional surface adapted to make contact with the interior of a shoe.

Abstract: A knit sock, especially for jogging or other athletic activity, has a foot portion consisting of a first inner layer or ply disposed inside a second outer layer or ply. The first ply of the foot portion has an inner surface adapted to contact the skin formed principally of yarns having high frictional characteristics, high thermal conductivity, and low moisture regain (hydrophobic). Its opposed surface is formed principally of yarns having relatively low frictional characteristics. The second ply has an inner surface which has low frictional characteristics and its outer surface is formed of yarns having relatively high frictional characteristics and high moisture regain (hydrophilic). The latter surface may also be formed with terry loops to enhance its shock-absorbing construction as well as to increase its moisture absorbing capacity.

Abstract: The sock has at least a foot portion consisting of a first inner layer or ply disposed within and attached to a second outer layer or ply. The first or inner ply has (a) an inner (next-to-the-foot) surface comprising a plurality of moisture-absorbing fibers such as cotton fibers around which a yarn such as a nylon yarn is spirally wound and also has (b) an outer surface comprising yarns of nylon, for example, having relatively low friction characteristics compared with said inner surface. The second or outer ply, has (a) an inner surface comprising yarns of nylon, for example, which also have relatively low friction characteristics and (b) an outer surface plaited on the yarns of the inner surface comprising a plurality of moisture-absorbing fibers such as cotton around which a yarn such as nylon is spirally wound.