| RefrigiWear Extreme Freezer Boot | Waterproof | Black | Ragg Wool/Leather | 13. RefrigiWear Boots | Comfort Rating: -45°F Waterproof The BOA® Fit System for a micro-adjustable fit that won't come loose When Old Man Winter is at his worst and the temperature falls below zero, call on the insulated Extreme Freezer Boot to get the job done. The Extreme Freezer Boot isn't your ordinary waterproof winter work boot. With a comfort rating of a chill-your-bones -45°F, these boots stand out from the pack with the BOA® Fit System for a micro-adjustable fit, our VitaComfort® system... - RefrigiWear Extreme Freezer Boot | Waterproof | Black | Ragg Wool/Leather | 13. |