PMD Hairwing Dun. Natural light elk hair form this wings on this imitation with ginger hackle trimmed on the bottom product a realistic imitation of the transition from nymph to dun. The Pale Morning Dun Hairwing is tied so that it sits in the top layer of the surface film, a fabulous smooth water fly but also works well in slower riffles and runs. Fly fishermen across the globe swear by this Mayfly imitation.