Walls Men's Zero-Zone Big Twill Insulated Coverall 55% Cotton, 45% Polyester Imported Machine Wash Walls muscle back technology uses a large band of elastic across the back to increase your range of movement, elastic inserts at back waist Hidden storm cuffs using comfort rib-knit, concealed front zipper covered by a storm flap Zippered chest pockets, front swing pockets with additional pass through, back patch pockets - left pocket has a concealed zipper for added security Single needle diamond-quilted lining with four ounce polyester insulation Durable trim scuff guard at back leg hems, ankle to thigh leg zippers covered by a protective storm flap