No, these are not giant marshmallows! This white plastic wrap is a protective covering for silage. Silage is basically "pickled" grass or corn. Farmers make silage by harvesting the entire plant of crops like corn or grasses. It is then chopped and stored in silos, or in plastic wrap like you see here. Bacteria then "pickles" the product by converting the sugar in the grass, which preserves it. This usually takes about two weeks. It is then stored until it is fed to ruminant, cud-chewing animals like cattle or sheep. Now you know about silage!