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Carhartt Super Dux Relaxed Fit Insulated Bib Overalls - Level 4 Extreme Warmth Size:3XL and productive when conditions demandLevel 4 Extreme Warmth Engineered for the Coldest Conditions When the mercury drops and the work doesn't stop, reach for the legendary Carhartt Super Dux Insulated Bib Overalls. Named after Carhartt's pioneering outdoor gear line from the 1930s, these aren't just overallsthey're your armor against winter's worst. Extreme Warmth Technology Level 4 Warmth Rating: Engineered for the coldest conditions on Earth 3M Thinsulate Insulation: Maximum warmth