a light - weight multi - layer insulating enclosure comprised of four different layers of materials to provide maximum insulation for containers ranging from relatively rigid to relatively flexible construction . the improved insulating qualities of the present invention are achieved through the use of an inner - most fabric liner layer , a second inner - most insulating layer which includes a polymeric foam , a third inner - most metalized polymer film reflective layer , and an outer - most fabric mesh layer . the enclosure is light - weight , collapsible and removable .