This is an optional innovation featured on my guitars. Why an inner dual wall? The reason is logical and has to do with the I-beam principle. It makes the sides much stiffer than the current traditional laminated sides. The advantages of having the strength of dual side walls are: a lighter braced top, elimination of any flying-buttress, neck stability for alternate tunings, supporting my braceless back and a more stable adjustable neck. This is a modern progressive step for those seeking improved acoustics in the sound and balance of their guitar.