Comfort Rating: -15°F to 35°FVibram® New Bifida with IceTrek® outsoleASTM composite safety toe Great for construction, DIY projects, dock/receiving employees, and much more, Ice Logger™ leather work boots not only keep you safe with a Vibram® electrical hazard compliant, non-slip outsole and ASTM composite safety toe, they also keep you comfortable with the exclusive RefrigiWear® VitaComfort® system. Fight foot fatigue and injury and get the job done with the Ice Logger™ boots. Comfort Rating: -15°F to 35°F 400g Insulation 5" Nubuck leather upper Vibram® New Bifida with IceTrek® outsole ASTM composite safety toe Waterproof VitaComfort® anti-fatigue and gravity-fed moisture management system Electrical hazard compliant 2 Speed laces at top Ice Logger™ Boot