Eggstacy Egg Fly Material- Eggstacy is unlike standard egg yarn material, which involves spinning yarn or stacking yarn. Eggstacy is built on a core which means you can simply tie it like a chenille and wrap it. Eggstacy is the first material to be made from new "Next Generation" (NX-Gen Fiber). NX-Gen Fibers are micro thin and designed to trap water, creating a slush-like texture when wet. Egg patterns and Blobs have never been so easy.