One of the the greatest fly tying innovations of the modern era. These spandex legs from MFC will not rot in your box over time, come with a fishy black barring and an array of beautiful colors. The idea of "a superior wiggle" is a bit abstract, but spandex legs of this sort have (in our opinion) the highest-grade wiggle available.
Come for the durability, stay for the life-like appearance.
see also Life-Flex: https://www.tacticalflyfisher.com/hareline-life-flex-leg-and-body-material-lfx/