Additional padding provided by double weave in order to provide comfort on uneven terrain and to boost thermal effect. Elastic band on the foot for greater fastenning and to prevent blisters or abrasions. Amazing thermic ability and softness. Nevertheless, it is important to notice that, since it is made with an empty core fiber, this sock has been ment to be used in dinamic activities. For static activities we recomend fibers like Merino Wool or PRIMALOFT® Yarn.