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 fastening and to prevent blisters or abrasions. Amazing thermal ability and softness. Nevertheless, it is important to notice that, since it is made with an empty core fiber, this sock has been meant to be used in dynamic activities. For static activities we recommend fibers like Merino Wool or PRIMALOFT® Yarn.