This is a Ben Paul pattern. The guys at OPST have really changed the game with their work on composite dubbing loops. This fly is the smallest yet. Tied on a size 14 nymph hook, it most closely resembles a caddis nymph. Shrimp pink ice dub and a rib make up the body. The collar is a composite loop containing sculpin wool, pheasant tail, barred predator wrap and a tan ice dub veil. A couple fibers of red pheasant tail as antennae finish off the head of the fly.
Swing this in your favorite trout stream and see if your results match ours!