I was just out checking something on the Warlock when I remembered that the sides were supposed to be made with divinycell. Wow! I pounded all the way down the sides of the boat and it sounds like a typical boat where you would only pound at a bulkhead - in fact it was not very noticeable where the bulkheads actually were. It should be a very quiet riding boat except for the engine in it. It really is a well built boat. Bill