An insulation unit including an inner lining having an inner face and an outer face, in which the inner face is disposed to define a cavity of the insulation unit is provided. An insulating foam is disposed on the outer face of the inner lining, and the insulating foam includes an inner face and an outer face, and the inner face of the insulating foam is adhered to the outer face of the inner lining. An outer lining is disposed on the outer face of the insulating foam. The outer lining includes a non self-supporting flexible skin which is adapted to define at least parts of an outer surface of the insulation unit and is adhered to the outer face of the insulating foam.