Blue impermeable film with oxygen barrier properties, manufactured with multilayer co-extrusion LDPE, and used under silage film to eliminate top and shoulder waste. Used widely, especially in Europe, the process of covering silage with first a thin blue impermeable film, prior to conventionally sheeting with a black cover. The secondary sheet sucks down onto the silage creating a vacuum, where all oxygen trapped under the cover is absorbed by the natural fermentation process in the clamp.