From the designer, Devin Olsen:

The Squirmy Worm has been a deadly trout catcher since its inception. However, its one drawback is durability. The DNA Worm is my attempt to replicate the appeal of the Squirmy Worm with other materials that also hold up a lot better to the teeth of trout. It catches trout in a similar way to the Squirmy but will not be bitten in half by the second fish you catch with it.