Designed for winter coverage without the bulk, the Merrell Coldpack 3 Thermo Mid WP Boot keeps our toes warm and dry on winter treks. The key to this coverage lies just underneath the durable leather upper. A waterproof and breathable membrane seals our the weather, while a plush fleece insulation seals in the heat while pulling moisture off of your socks. This coverage allows us to trust the reliable traction of the Vibram outsole on crunchy and frozen trails.