I use the Thomas 11.5” on larger days on my CJ Nelson 9’9” Parallax (the Waxhead 10” on medium and small days). The Thomas 11.5" holds big lines and carves really well. It is also good on smaller days for locking in the tail for nose rides. But is slower to do turns on the small days. But on those bigger days this fin is my 'go to' fin!!!!