This the biggest Salmonfly pattern we carry, and when the fish are truly dialed in on the big bugs, it's a blast to watch them come devour this gigantic fly. The wood duck wings seem to be a real trigger for the fish, imitating the naturals that land with their wings splayed on the water. They also provide plenty of movement along with the rubber legs to give the impression of a struggling insect, and the trout go nuts for it!