The Carhartt Men's Loose Fit Firm Duck Insulated Biberalls are for work doesn't take a snow day. These men's loose-fit biberalls help you get the job done in wintry conditions. They're made of heavy duck canvas with Arctic-weight insulation for added warmth. Triple-stitched seams and durable kick panels mean they're built to last. Ankle-to-thigh leg zips make for easy on and off over boots.