Product Description COLD INSULATION Purofort® boots prevent heat loss and offer outstanding thermal properties. Due to the unique recipe and molecular structure, all Purofort boots assure excellent cold insulation down to -20°C. And even down to -50°C in case of Purofort Thermo boots. Purofort boots are classified as CI, meaning that the temperature decrease measured at the upper surface of the insole does not exceed 10°C after 30 minutes.
