The Rock Fall Manitoba Freezer rigger safety boots are 100% non-metallic with a shock absorbing solid nitrile rubber outsole. The Manitoba is a cold temperature boot developed with specialist materials that are certified for use in temperatures as low as -40 Degrees C. Includes 3M Thinsulate B600 Ultra Fursulate fur lining and a no. 8 YKK side zip for convenience. Meets Standard EN ISO 20345:2011 S3 HI CI HRO SRC, ASTM F 2413-18 M/I/C PR.