This is my favorite version of the Cased Caddis. The combination of furnace hackle and turkey tail fibers represents the case very well and the fish seem to agree. I like to dead-drift this pattern by itself, and find it very effective through boulder fields and pocket water.
The Cased Caddis Recipe
Hook: #10-16 Caddis Emerger
Thread: 6/0 Black Uni-thread
Underbody: 12 wraps of medium lead wire
Abdomen: Turkey tail fibers and furnace hackle spun together