Seam-sealed waterproof construction with waterproof suede and leather upper. Removable 6mm felted wool and shearling leather Inner Boot. The midsole features a 2.5 mm bonded felt frost plug, providing increased support. Handcrafted waterproof vulcanized rubber shell with herringbone outsole, that is slip resistant and shock absorbent. Sorel rated: -25° Fahrenheit / -32°.