such that the opening 22 when in the 34 use 34 position depicted is downwardly directed an open mesh element generally formed from expanded aluminum and relatively closely packed together but permitting air to freely pass therethrough is positioned in the passage 16 generally within inner end 14 such positioning serves the function that it enables the element 24 to maintain constant mouth cavity temperature thus preventing water particles on the element from freezing in cold weather thus it may be apparent that the device 10 of the present invention not only may heat the incoming air to the user 39 s oral cavity by means of the heat residing in the element 24 by the previous exhaled breath but also that such element and the walls of the device 10 itself may be heated by conduction by its position in the mouth cavity in other words the user may run with the major portion of the device projecting from his or her lips or alternatively if a greater heating effect is desired position the device such that only a small portion including the opening 22 projects from the user 39 s lips in any event the shape of the inner end 14 is such that the device can be comfortably held in the mouth.