A dry fly is a fly that is designed to float on the surface of the water.
Examples of common dry flies include the Elk Hair Caddis, the Blue Winged Olive, the Parachute Adams and the Royal Wulff.
Dry flies are constructed of relatively buoyant materials – usually feathers and fur (real or synthetic) or foam – and are used mostly in trout fishing to catch rising fish or fish that can induced to rise.
Dry flies can be conventionally hackled (with the hackle wrapped around the hook shank) or parachute hackled where the hackle is wrapped around a vertical post.