Double layered yet light in weight. The Ultimate Lightweight Walking Sock from 1000 Mile has a 100% Tactel inner which wicks away moisture while the soft wool-max outer layer moves with the shoe. A lack of friction between the layers prevents blisters and wear.FeaturesDouble layered - the two layers work together to prevent friction, which causes blisters.100% Tactel inner layer - stays with foot and wicks away moisture.Soft wool-mix outer layer - moves with the shoe.Recommended activity - walking