The Wills MB Twist Thorax from MRFC is an emerger tied in size #12. Size #12 covers the naturals trout encounter most often.
Trout feed with confidence on emergers, which cannot escape. Present it dead-drift in the film during a hatch, and watch the rise forms to dial in the depth. Deadly during any mayfly or caddis hatch, when fish key on the helpless stage.
