The Double Decker was originally born as a comparadun style fly for river fishing and catching rising fish in shallow and fast water. The profile of this fly ensures that the deer hair wing is highly visible yet the deer hair body and coq de leon tail is sumberged- giving the profile of a hatching fly. Not only is this pattern highly effective for river fishing but is now very popular on the stillwater scene. This is also a fantastic fly to use in a sedge hatch.Hook- Short Shank Size 12.Overall length- Approx 12-15mmTail- Coq de leonBody- Hares Ear/Fox SquirrelWing- Deer HairInternational Comp legal- Yes.