Our duck zip-to-waist biberall is quilt-lined for comfort. Made of 12-ounce, rugged 100% cotton duck, it's lined in a midweight nylon-quilted polyester. It features zip-to-hip leg openings with wind flaps and snap closures and double knees with cleanout bottoms to accommodate knee pads. Main seams are triple-stitched for durability. Upcharge for size 52+.