A floatable barrier suitably adapted for use with a beverage container having a circular base and a cylindrical wall extending vertically therefrom. The floatable barrier comprising top and bottom planar surfaces for displaying advertising material thereon and for floatingly engaging a substantial portion of a comestible liquid contained in the beverage container, respectively; an outer wall integrally connecting the top and bottom planar surfaces along the periphery thereof principally serving as means to space apart and maintain a parallel relationship of the surfaces to form an inner chamber possessing thermal retaining and buoyancy characteristics; and a plurality of apertures collectively located along the periphery of and extending from the top planar surface to the bottom planar surface, through the inner chamber, to assist in promoting the condition of laminar flow over the floatable barrier as the beverage container is being filled with the comestible liquid.