The Solitude Crack Back PMD is a realistic and highly effective nymph pattern tied to imitate the Pale Morning Dun (PMD) mayfly in its vulnerable, pre-hatch stage. This fly is distinguished by its durable, epoxy-coated or UV-resin “crack-back” shell casing, which creates a segmented, translucent, and highly realistic appearance of the natural insect’s exoskeleton. Sinking quickly due to a small bead or weighted underbody, this fly is essential for targeting selective trout when the prominent PMD hatch is underway.