It has a wing of CDC feathers which have natural buoyancy and is a versatile pattern which can be used to imitate small sedge, olives or midges.
3 CDC F FLY Olive Midge Sedge EMERGER Dry FLIES Trout Fly FISHING
Fly Tying The Fishing Gene
Flies For The River Avon (Wiltshire) – Peaks Fly Fishing
Olive F Fly CDC trout fly - Troutflies UK
Sandy's River Fly Box
Top 10 grayling flies for October on the amazing Welsh Dee
3 CDC F FLY Olive Midge Sedge EMERGER Dry FLIES Trout Fly
Hot Time Emerger - The FlyFisherThe FlyFisher
The 10 Best Trout Flies for Late Fall Fishing
Shuttlecock Buzzers & Emerger Fishing Flies - Peaks Fly Fishing