A magical material that turns translucent when gotten wet, great for using on nymphs and even some traditional salmon fly patterns. Troutline recommends soaking the material (the amount you are going to tie with) in warm water for 2-3 minutes before tying as it makes the material much easier to tie with.
small (for hook sizes 14-16)
Medium (for hook sizes 12-14)
Large (for hook sizes 8-10)
Each packet has approximately 50cm of biothread in it.