The M series is wider for extra hold and stability. The fin can be used in a 2 + 1 set up, but performs best as a single on longboards with a wider tail than 15 inches.
|Construction & Flex:||Fiberglass Construction|
|Futures System Tech:||Truss Base|
|Depth:||9.5in - 24.13cm|
|Futures Foil Tech:||Flat Foil|