AirFlo SuperFlo Flats Universal Taper Fly Line Sand/Blue SkyHeavy crabs into gnarly winds one day, and bonefish patterns into a light breeze the next. When you don't know what to expect, a do it all flats line is the answer. Designed to load quickly, the short belly and long rear taper create the most versatile line in our saltwater flats range. This is the taper for the vast majority of conditions, fly rods, and anglers.