Cold and heat resistant: Feel free to put the stretchable food lid in the freezer or even in the microwave and dishwasher. Since the silicone material is resistant to low and high temperatures, the bowl stretch lid will remain intact and as good as new for a very long time. Eco-friendly and economical: The silicone stretch cover lids will reduce your plastic waste and help you save money since you will no longer need to buy cellophane to cover your leftover food fresh. Plus, the bowl lid does a much better job of keeping your food fresh.