These Frost Super Duck Insulated Bib Overalls combine 12 oz. cotton with polyester sanded duck and 6 oz. diamond quilted insulation for warmth in all conditions. Durability are its middle name, with triple-needle stitching, double-knee patches, and a scuff guard at the hem. Ankle to thigh leg zippers and elastic at the back waist ensure flexibility and ease of motion. Material: Cotton, Polyester.