Lighter fabrics and less of them. We all know Willy J did not invent this concept (or did we?) So if we are not the only ones to do this, why does our equipment so flagrantly out perform the others? It comes down to good design, the best components in the world mean nothing if they are not put together utilizing years of experience and careful thought as to the products application. Oh and one other thing... a lot of trial and error.