One thing many people become confused about is the real difference between "Flemish" and "regular" strings. A "Flemish" string is simply a style of string, it is not a separate class of string material, as with FastFlight and Dacron. A Flemish string is a type of "continuous loop" string and can be made of any material suitable for bowstrings. Instead of twisting and serving the loops, as with the "regular" continuous loop string, the loops are braided together and into the main body of the string.
Even though the loops of a Flemish string are not served, the area which receives the arrow nock does require serving for greatest durability.