The North Face ThermoBall™ Progressive Zip II Waterproof SKU 。The insulated Men’s ThermoBall Boot Zip-Up will help keep your feet warm, protected and comfortable through the winter. Upper: Waterproof, PU-coated leather upper Recycled P.E.T. baffled-ripstop shaft with a non-PFC durable water-repellent (non-PFC DWR) finish for added water repellency ThermoBall™ Eco 100% recycled polyester insulation helps keep feet warm even when wet Sole Unit: Lightweight, injection-molded, ground-contact EVA midsole/outsole UltrATAC™ rubber outsole for high-level traction