an elastic supporting and sealing member , for mutually supporting a first body and a second body , and for sealing the gap between the first body and the second body , includes a first portion and a second portion of wire net and a piece of thermal foaming material , between the first and the second wire net portion , which expands and foams when it is heated up . a method of making such a member includes the steps of flattening a tubular shaped piece of wire net , and of introducing a strip shaped piece of such thermal foaming material between the two sides of the flattened tube of wire net , so that the longitudinal directions of the strip shaped piece of thermal foaming material and of the flattened wire net tube substantially coincide .