The hybrid twin finds that sweet spot between the drive and speed of a keel and the loose responsive feel of an upright twin. This fin has medium area and a flat inside foil, perfect if you?re looking to loosen up a traditional fish or to add some drive and speed to a fun-shape or performance twin. It will also totally change the way your regular shortboard surfs. A modern keel fin fine tuned for performance surfing with glide and flow.