Hook: Demmon N500 #12
Thread: Veevus GSP
Ribbing: Veevus Fluo Orange Thread
Tail: Coq de Leon Pardo Medio
The fly is super simple, you can make it in different color combinations. I personally find the olive, yellow and gray combination very efficient on waters from Poland , Italy and Slovenia. Maybe because is not a solid color and in this mix trout finds the local shades.
The fly should be big and spiky, I make it in size #10 and 12 and rarely in #14 and I fish it in high waters and in strong currents behind big rocks. Trout seems to love it 🙂