It is a leader made from thinner elements, either tying thread or mono that are twisted such that they "furl". The furled sections are interlocked so that they elements at the butt of the leader are made of more threads, and they gradually form a taper as fewer and fewer threads are used for furling in the more distal section. There is a loop at each end of the leader, one to attach to the fly line and the other to attached to a separate tippet section.
Kathy is a fly fisher who has made a DVD on furling leaders and also a kit that supplies the basic tools to make your own.
Some folks swear by them because they lay out well on a cast.
Here are articles on how to make them:
http://www.peninsulaflyfishers.org/T...ed_leader.html
http://www.hatchesmagazine.com/page/may2006/185
Last edited by Silver Creek; 10-15-2009 at 05:54 PM.
Regards,
Silver
"Discovery consists of seeing what everybody has seen and thinking what nobody has thought"..........Szent-Gyorgy