New Bug Yarn is a 100% Acrylic Yarn made in 4ply format, which means you can easily seperate it into 4x strands. Use one strand for smaller fly bodies or double up for thicker profile flies. Being 100% acrylic, this material is very strong, much stronger than wool. Another advantage is it can be dyed into great colours for natural flies. This initial range is dyed into some of the most popular colours for natural nymph patterns or dries. It’s been a big hit on the river for czech nymph and jig flies.