The Khombu Women's Bounce High Apre Boots are a perfect combination of style and warmth. The upper is made of waterproof synthetic that looks like the real thing. Plush fur lining makes a cool accent and helps keep you warm. The insole is a comfort insole with Thermolite, moisture wicking, Anti-fungal, breathable, fast drying, and shock absorbing, Insulated cushion that keeps your feet comfortable. It has a non-slip outsole so you can navigate through any conditions. It is cold rated to -20 so they are perfect for any trek into the cold.