One of the most specialist styles we have. Do you work in extreme cold temperatures? 100% Non-Metallic, the Alaska is a cold temperature high leg boot certified to -40Â°C. â€¢ Protective fibreglass toecap and composite anti-penetration flexi-midsole â€¢ Premium black full grain anti cracking waxy smooth leather â€¢ Injection moulded scuff cap to prevent wearing â€¢ 3M ThinsulateÂ® B600 Ultra and Fursulate Fur Lining, Certified to -40Â°C â€¢ Nitrile rubber, slip resistant outsole â€¢ Manufactured to exceed EN ISO 20345:2011 S3 HI CI-40Â°c HRO SRC Why Rock Fall? Second Generation Family Business delivering Safety Footwear excellence since 1997. Designing the largest range of specialist styles from size 2-16 built for Longevity, Comfort and Compliance. Over sixty trusted styles from Foundry to Coldstore, Office to Offshore, Electronics to Rail.