A serious answer to serious weather, this performance pull-on features a full 200 grams of Thermolite insulation, premium waterproof leather and Cordura mesh uppers. Adjustable elastic closures keep feet warm and dry. With removable breathable inserts, full Poron midsoles and the Sebago Vibram Monsoon sole, to take on whatever winter hands out. Waterproof Construction. Premium Full Grain Waterproof Leather and Cordura Upper. Medial Side Drainage Ports between Upper and Waterproof Lining. Brushed Polyester Fleece Lining with 200 grams Thermolite.