When a golf ball goes through 12 iterations, the people creating it probably have learned a few things over that time, such as how to maintain an extremely cushy feel while enhancing distance. To achieve that, Srixon changed the way the core gradually transitions from soft in the centre to firmer towards the perimeter. This provides increased resiliency for more rebound at impact.
The thin ionomer cover (just 0.063 inches thick) has a 338-dimple pattern that helps reduce drag and provides more lift as the ball slows down during its descent. The result is increased carry.