The present invention provides an insulating batt of non-woven fibers. This batt is comprised of synthetic fibers, natural fibers, bonding materials or any mixture thereof. It is characterized by an axis of length, an axis of width, and an axis of thickness, wherein the extreme fibers at one end of said axis of thickness form the proximal face of the batt, and the extreme fibers at the other end of said axis of thickness form the distal face of the batt and wherein either said distal face, said proximal face or both faces are essentially non-planar faces.