| RefrigiWear Extreme Double Dial Pac Boot | Waterproof | Lightweight | Black | Ragg Wool | 11. RefrigiWear Comfort Rating: -60°F to 10°F 2000g Insulation Lightweight BOA® M4 dials at side and back These boots are made for working, and that’s just what they’ll do. Featuring the innovative BOA® Fit System, these work boots offer a micro-adjustable fit with lightweight BOA® M4 dials at the side and back for a customizable and secure feel. With 2000g insulation and a HYDRY® waterproofing system, they provide unrivaled warmth and protection in temperatures as low as -60°F. These boots... - RefrigiWear Extreme Double Dial Pac Boot | Waterproof | Lightweight | Black | Ragg Wool | 11. |