Mount a short wet hook and start thread behind the eye; run a thread bed back toward the 75% point.
Lash a pair of foam cylinders across the top of the shank just behind the eye with tight figure-eight wraps to form big booby eyes; add a drop of glue. These floats lift the fly off the bottom.
Carry the thread to the bend and tie in a full marabou tail about one and a half shank-lengths long; bind the butts forward and trim.
Tie in the Fritz chenille at the bend.
Wind the fritz forward in touching turns to a full, fuzzy body, stroking the fibers back after each wrap; work up to the foam eyes and figure-eight a turn or two behind them to fill the gap.
Tie off tight behind the foam eyes, whip finish behind the foam, and add a drop of cement.
Pick out the fritz fibers so the body bristles.
Other versions
3 more in the app: Classic Recipe (2), BCFlyguys, Sunburst.