Fiber-reinforced foam panels not of metal in the nature of ultralight polyurethane foam, polyethylene foam, polyisocyanurate foam, and open cell foam panels for use in the manufacture of boat hulls, car components, aeronautic components; foam panels in the nature of ultralight polyurethane foam, polyethylene foam, polyisocyanurate foam, and open cell foam panels reinforced with through-fibers not of metal for forming cores of composite materials for use in the manufacture of boat hulls, car c...