Features of The North Face Men's ThermoBall Zip-Up Boot Upper: Waterproof, PU-coated leather Upper 100% recycled Pet, baffled ripstop shaft with durable water-repellent (DWR) finish to keep feet dry Lightweight ThermoBall Eco Insulation retains warmth Water-resistant, PU-coated medial zipper for easy on/off OrthoLite Eco LT Footbed made with 5% recycled rubber content Sole Unit: Lightweight, injection-molded, ground-contact EVA Midsole/Outsole UltrATAC rubber Outsole for superior traction