Sixton Montana Endurance 81156-23L S3 WR CI SRC Safety BootWhen working in extreme cold, its important to have a boot that keeps heat in and cold out. The Montana Endurance half knee boot is a rigger boot style laceless boot with a wool interior lining offering maximum comfort and increased insulation. Like a lot of the safety boots in the Sixton range, this boot has a ceramic toe cap offering protection to the toes against falling objects up to and over 200J and retaining the shape of the boot. In freezing