My favourite kind of no-hackle dry fly. I use natural wool, that absorbs any kind of fly floatant easily. With the air filled body hair from deer this floats right in the surface – imitating a hatching mayfly dun. This has been one of my go-to dry flies for more years that i care to think about :0) I even use it for sea trout dry fly fishing in rivers and saltwater. You can tie it in colours to mach any hatch – and wrap up a a dozen or two in an hour.