| RefrigiWear Extreme Pac Boot | Waterproof | Lightweight | Black | Ragg Wool/Leather/Nylon | 13. RefrigiWear Boots | Comfort Rating: -60°F to 10°F The BOA® Fit System for a micro-adjustable fit that won't come loose Anti-Slip RefrigiWear® outsole You’re not one to put your feet up on the job, even with long shifts in extreme conditions. Fight foot fatigue and frigid conditions while staying safe with the Extreme Pac Boot, comfort rated for temperatures as low as -60°F. Our cold-weather work shoes have 9-inch waterproof nylon and leather uppers. These winter work boots fight fatigue with... - RefrigiWear Extreme Pac Boot | Waterproof | Lightweight | Black | Ragg Wool/Leather/Nylon | 13. |