I have a 9'4 square tail log. I purchased the Raked fin in a 10inch. It's a pretty rad fin overall. Actually larger than I thought. I barely had about 1 inch of play left in my fin box. I imagined it to feel more like a flex fin but it was a little stiff at some points. I'd almost recommend sizing down a half to full size if you want a little more flex to it. Otherwise if you know what you're doing it locks you in pretty good! You can get to the nose and stick it or if it's the right wave you can get some nice turns in while trimming. Just be aware and use their chart with the measurement details so you can dial one in to fit your style. Again overall pretty rad fin! I ended up getting the Alex Knost flex fin in the same size and I love it! I'll keep the Raked as a backup. Other than UPS taking forever to deliver. I'm stoked.