The COLD TERRAIN TEXAPORE MID winter boot is lined with NANUK fleece for an extra portion of insulation. It keeps your feet warm in temperatures down to -20°. And our weatherproof TEXAPORE membrane makes it fully waterproof. The COLD TERRAIN is made entirely of synthetic materials, so it requires less care and maintenance than a leather boot. The WOLF SNOW sole is made of a special rubber compound and has an advanced tread design for a secure grip on winter terrain.