Another popular colour variation is the Olive WD40 this is a new addition to the fly world and has already gained a phenomenal catch record across the US and Canada. It is a awesome performer and has quickly proved itself as the emerger not to be without. This Olive WD40 is a good general imitation of both Mayfly and Emerging Midge Nymph pattern. The Olive WD-40 is best fished on a dead drift as a Pupa Midge at the end of your drift lift your rod to bring your WD40 to the surface replicating the natural movement of the emerger. Try these out on your favourite tailwater or creek you won't believe the results.