https://www.trivenipackaging.com/packaging-materials/lidding-film/
CRYOVAC® lidding films for food create an airtight seal with flexible, foam, or rigid plastic trays. Gas flushing creates a modified atmosphere with high or low oxygen levels, which extends the freshness of the product. During refrigerated storage and display, the lid films remain fog-free, providing a clear view of the product, which improves the merchandising appeal of both fresh and processed food products.