The Double Humpy doesn’t resemble one insect in particular, and that?s why it’s special. A trout fly that could be a caddis or could be a mayfly. Either way, trout will smack it when the time is right. Fish this fly during the peak of caddis and mayfly hatches in the summer when trout are most keyed in on these insects. A great choice for fast rough water as well as the lead/indicator flies in a dropper set up.