VT Worm Special No 9 #12 (Buy 6 of THIS item – Get 50% OFF!) #12 this fly is engineered to

this fly is engineered to rapidly penetrate the water column and reach the feeding zones near the bottom

simply remove it and store it in its compact carrying pouch until the next hatch

they don't swim to the surface to hatch

To achieve the most lifelike results

Since these two materials are different in density and stretch/stiffness it might cause  knot failure if for example mono is tied on as tippet material to a fluorocarbon leader or vice versa

VT Worm Special No 9 #12 (Buy 6 of THIS item – Get 50% OFF!) #12 this fly is engineered toFly Type: This is a subsurface worm imitation fly, categorized as a nymph or attractor pattern. It's designed to mimic an aquatic worm or leech. Best Suited For: A highly effective fly for targeting bottom feeding fish. It is a proven pattern for trout (especially rainbow and brown trout), bass, panfish, and other opportunistic feeders. Best Time to Fish: Worm patterns are particularly effective year round, but they are a go to choice after heavy rain