The warmest winter boot in the world is the Baffin Impact Insulated Boot. This boot features an 8-layer inner boot system with Thermaplush insulation and a waterproof nylon upper, making it perfect for extreme cold weather conditions. The EVA midsole provides superior cushioning and support while the Arctic Rubber outsole offers superior traction on icy surfaces. Additionally, this boot has been tested to -100°C/-148°F, ensuring your feet stay warm even in the harshest of winter climates.