Since the introduction of the integrated head people have accepted the idea that a fast sinking line can be extremely effective and easy to use. Airflo created the Depth Finder lines to take care of all the conditions an integrated head would be used. With the highest density material in the industry, Airflo lines sink faster than PVC lines to help get the fly into the zone and keep it there. They are equally at home in rivers as they are in the salt. Because of their unusually high sink rate, many people find they can change their tactics and use larger flies or fish in water that was moving too fast for other lines. Depth Finder lines feature Power Core technology for low memory and low stretch to help feel everything that is happening to the fly. The low stretch core also helps set the hook, even at long distances. A new ultra durable sleeved weld connects the head to the running line.