If you're going to choose a round tail. The round tail as you notice, the template, the width stays wide all the way and then it rounds out and comes around the other side. Basically, this is going to be your loosest tail. Why it's going to be your loosest tail is because you have so much curve in the outline all the way around the tail. It keeps the area in the very back of the tail and up forward like a short board. The water flow will come around here hold onto this rail line as it curves around and hold all the way until it releases off the tip of the tail. The performance in that, it's going to hold you in your turns and keep your speed all they way through your turns. The difference between the round tail and the round pin tail; the round pin tail will come around this same curve and then have a little extended peak or a little pin on the end of the tail, which gives you a little extra bite and projection. That's your round tail.