BioPak Paper BioBowl Lids are made from premium paperboard and coated with Ingeo™ – a bioplastic made from plants, not oil. We use a heavy-duty, premium quality board, giving our paper bowl lids superior stability, better fit and insulation to match our paper bowls. Our bowl lids are also soup-safe and suitable for hot or cold food. Our paper bowl lids are suitable for contents up to 60 degrees. For anything hotter, please use CPLA or PP lids.