The New Twin Keel shape. The main areas of difference from the Retro version are the bottom contours. Traditionally flat to long tapering vee off tail, this version is flat to mild concave for lift and speed in the pocket. The concave will have some pop off the top, no vee means better bite and release from the rail and fins. The nose template is narrowed from the Retro version and the rails are more tapered for sensitivity. All the great aspects of the traditional twin keels with out all the hang ups.