Manufactured with the highest quality fabrics and with the usual high standard craftsmanship. All vinyl seams are heat sealed, all hems are double lock stitched. D-rings (if used) are heavy, welded style and tack stitched to insure high tension strength. These tarps are available in any of our fine coated vinyl selection, or with a combination of vinyl weights. Standard tarps are 18 oz. vinyl coated fabric.