Description Rock Fall RF001 Alaska Freezer Winter Safety Boots Protective toe cap and midsole, Alaska winter safety boots is a cold temperature boot developed with specialist materials that are certified for us in temperatures as low as -40°C, including 3M Thinsulate B600 Ultra, Fursulate fur lining and a shock absorbing solid nitrile rubber outsole. These work boots are perfect for those working in physically demanding jobs in dangerous environments such as building, construction, cold store and also other industries. Unsure what safety footwear you need for your work or industry. We can help, click here… Unsure what the Safety and Slip Rating Codes (SB, S1P, SRC etc.) We can help, click here… Features S3 CI HRO SRC ASTM F 2413-18 M/I/C PR EN ISO 20345:2011 Protective fibreglass toe cap and composite anti penetration flexi midsole 3M Thinsulate B600 Ultra fur lining – tested to -40°C Shock absorbing nitrile rubber outsole Anti fatigue fur EVA footbed Materials Upper: Water repellent full grain leather