PMD Sparkle Dun

Fish it during a Pale Morning Dun hatch on western spring creeks and tailwaters, once fish settle into picking off duns in the film rather than fully hatched adults.

The flush-riding deer-hair wing and trailing shuck put it right at the surface-tension line naturals struggle through longest, so it reads as the vulnerable half-hatched PMD rather than the escaped adult heavily-fished water has taught trout to avoid.