I use white cotton thread (mercerized) for my furled leaders construction. Just like your blue jeans these furled leaders last forever and a day...

You can also used colored cotton thread (mecerized) with each of the two runs a different color or shade of color, depending on the stream/river coloration...

~Parnelli

I spent 4 years perfecting my "Big Furled Leader Formula", that have have sent out at no cost to the party requesting the CD, to flyanglers all around the world...