Assos Ultraz Winter Socks Black SeriesThe key to maintaining warm feet while riding in winter is to combine insulation with the ability to stay dry from the inside and the outside. These Socks combine the stretch and moisture management of synthetics with the superior insulation properties of wool. Compared to its predecessor, the insulation has then been tripled across the toe and up the blue panel beyond the arch, providing extreme warmth for the coldest days.