The Chubby Chernobyl is the modern Western workhorse for big-fly fishing. Foam keeps it floating high; rubber legs add motion that triggers strikes; the wing post makes it visible at distance. Tan, purple, gold, or chartreuse cover most water and most light.
Most often used as the indicator fly in a hopper-dropper rig — the foam easily supports a heavy nymph 20+ inches below. Fish it tight to banks and undercut structure during summer.