Solid cowhide leather, not patchwork Leather thickness: 1.3-1.4mm (3.5 oz weight) Heavy duty zippers Reinforced stitching for durability Fully lined with polyester lining Padded knees Stretch panels on the sides and at lower back Two outside pockets There is an 8" zipper attached on the back which allows to connect these pants to any jacket that has a similar zipper. If you already own a good jacket without the back zipper, enclosed with the pants, you will find an extra piece of the zipper that can be attached to your jacket.