Originally created as a bass fly in the Ozarks, the woolly worm has been an effective trout-catching pattern since the 1950s when Don Martinez of West Yellowstone, Montana commercialized it. The fly can be fished as a wet fly, a nymph or even a streamer and can be tied in any number of color variants.
Hook: #6-10 2-3x long
Weight: optional weighted wraps
Tail: Red wool
Body: Yellow chenille
Hackle: Grizzly rooster