The stretch film is used in the agricultural field for the preservation of the silage. It makes a safe barrier against the oxigen because it seals the bale to make it waterproof and airproof. We advice at least six layers, but we also advice to increase the layers according to the solar irradiation, the degree of the humidity of the hay and the size and the weight of the round bales. These characteristics are intended for the stretch film preserved in a dry place and keeped in its original package until the day of usage.