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 keeping your feet dry and puncture-resistant plates to protect you in any terrain. The entire Extreme Collection, now with head-to-toe protection, was designed for comfort, style, and the ultimate protection. When the cold warns you to stay at home, take it to the Extreme. Comfort Rating: -45°F 1200g insulation 8" Leather upper Anti-slip outsole ASTM/CSA composite safety toe The BOA® Fit System for a micro-adjustable fit that won't come loose Waterproof CSA puncture-resistant plate Rubber toe guard Rubber heel guard for easy kickoff VitaComfort® anti-fatigue and gravity-fed moisture management system SR-EH Approved ESR/Electrical hazard compliant Extreme Freezer Boot