A seat element includes a carrier frame and supporting surfaces. The carrier frame includes at least one left-hand side member and a right-hand side member. The supporting surfaces are designed in the form of a seat surface and backrest surface. At least one of the supporting surfaces includes a covering element. The covering element includes a fabric and is stretch-mounted, on the left-hand side member and on the right-hand side member of the carrying frame. The covering element includes tension elements. The tension elements are subjected to pulling action by means of in each case at least one of the actuators in such a manner that a level of tensioning to which the fabric of the covering element is subjected when the actuator has been activated is greater than a level of tensioning to which the fabric of the covering element is subjected when the actuator has been deactivated.