Anyplace you'd fish a stonefly the Doc's Cork fly works great. The biggest benefit to this foam fly pattern is that you can fish it so much longer, keep it on the water, and fish heavier, choppier water than you can without foam. So you catch more fish because you're fishing more, rather than always dressing or drying off your fly.In Mahogany, Orange, Yellow. Foam fly in sizes: 12.