Nazsail, There is actually no 4.5 Kaos, the sizes are 4.2 then 4.7. I used my 2012 4.7 for the first time Thursday at Ricketts and had a ball.
There is also the new Killer if you want a grunty, power wave sail, same sizes. With Killer you can almost go a size smaller as it has big amounts of bottom end power. Great for those sailors like me who challenge the bathroom scales and don't like pumping

Both full Xply construction.
I guess there were a few small wave sails getting used late yesterday, it cranked.