Here's a handy chest-to-waist zipper overall in 12-ounce, rugged 100% cotton duck. It's lined in a midweight nylon-quilted polyester. Leg zippers open all the way to the hip and feature wind flaps and snap closures. Other features include double knees with cleanout bottoms to accommodate knee pads. Main seams are triple-stitched. This Biberall is one of Carhartt's most versatile overall designs. And, of course, you can count on the fact that it's been fabric tested to guarantee top quality wear in all key areas.