Tying flies so that the under-body thread color shows through the wet over-body tying materials can create highly effective fish catching fly patterns. Here is one tying technique that effectively demonstrates this style of tying flies. Wool yarn is another effective tying material for achieving this same kind of tying effects that may be more available to Tenkara fly tiers and require no additional material investments to achieve. Here is a place where the FL-Threads really shine with out being too overly bright. Enjoy…Karl.