A flexible item composed of one or more kinds of fibers prefabricated into various shapes and sizes. it may have a vapor barrier and is covered on one or both sides with a jacket material such as vinyl or other sheet material. it may have mounting provisions such as holes or snaps to facilitate installation. it is designed to cover cargo compartments and the like to prevent the transfer of heat and/or sound. excludes insulation material supplied in flat sheets or rolls used in construction and building materials. excludes insulation blanket,thermal.