Your question actually does make a lot of sense. When using Tapered leaders, it is more of a one size fits all scenario. If you decide to try furled leaders, we actually offer leaders based on fly line diameter. Meaning one leader is good for a 0-3 wt, then we move up to a leader for 4-5-6 wt rods and so on. As mentioned previously, you want the fly line dia and the leader dia similar for a smooth transfer of energy. With a thread furled leader, you can throw 4x tippet as well as 7x tippet with same leader. This means when the hatch changes, you simply change the length of tippet that is appropriate for the fly you are throwing. Smaller fly equals smaller dia tippet…. Hope this helped. If you have any questions, please do not hesitate to contact me though the email below.