An apparatus for treating exhaust gases from a mobile internal combustion engine includes at least an exhaust pipe with a direction of extent, a honeycomb body having at least ceramic or extruded material, and at least one metallic fiber mat, which is at least partially disposed between the exhaust pipe and the honeycomb body. At least two zones with different functions are formed in the direction of extent by the at least one fiber mat. At least one first zone serves a function of mounting the honeycomb body, and at least one other zone serves a function selected from the group consisting of thermal insulation and forming a seal against gas. A vehicle having the apparatus is also provided.