From True Ames:
Fin designed by Kirk Putnam and Brian Hilbers...the PHD (as seen in our featured short film "Meridiem Odyssey")
This fin's fuller than normal leading edge, combined with the slender tipped but full-based template targets smooth rail turns while harnessing maximum power. Usually powering a “hull” type shape or mid-length surfboard this fin excels in combination with thin rails and vee to flat bottom. It has been noted that this design: feels good at low speed, has heaps of power with the stiffer flex, has proper hold in all phases of a turn, and has a perfectly balanced feel.
As part of our Volan Fin Collection, the PHD's are finely tuned with only the best precision foils and are subsequently loaded with the most ideal amount of flex. Each fin is uniquely crafted with care here at our factory in Santa Barbara, and go through the strictest quality control. Fins made with Volan fiberglass are properly aligned for optimal weave orientation and have very high performance flex characteristics — with the flex coming more from the body of the fin rather than just at the tip.
own it from $10 a week with More info