The warmest boots we have come across from the Canadian firm Sorel. This model has a 2,5 mm insulated sole that definitely protects against the cold. As well as a waterproof outsole.
Fit and size guide
Sorel Caribou Wool are A BIT BIG . The last will fit REGULAR and SOMEWHAT WIDE feet.
The fit of the shoes will vary between models and brands. Please use our measurements.