Carhartt Ladies' Washed Duck Insulated Bib Fort Brands Original Washed Insulated Mens Bib Overalls Short Bark Mens outfits Tough Duck Insulated Bib Overall Hero Outdoors Carhartt Women's Relaxed Fit Washed Duck Insulated Bib Overall Academy. Warmth Rating Earned: Level 3 Warmest Engineered For High Warmth in Severly Cold Conditions. See Technology section below for more details. Made to hold their own through cold and wind, these women's heavyweight bibs are the hardest working overalls around. They're made of our rugged ringspun duck with flex side panels for a comfortable fit. The quilted nylon lining is insulated through the legs, and reinforced kick panels lend long lasting durability.