The North Face Back-To-Berkeley Boots PU-coated, ballistic mesh and polyester upper gives a unique classic look with new school technology. Waterproof suede mudguard and Hydroseal waterproof technology keeps moisture out and deflects excessive dirt. 100 g PrimaLoft Eco Insulation helps your feet ventilate and remain comfortable throughout the day. Ortholite sockliner and Die-cut EVA midsole gives your feet a sense of relief by providing stability and comfort for those long winter days. Long-lasting TNF Winter Grip rubber outsole with Ice Pick temperature sensitive lugs gives you a firm grip on any surface during extreme winter weather.