Love that the lid can be heated in the microwave - without fear of harming my body and health, unlike plastic!!! Love the silicone lids that do not break, crack, tear - and become more plastic pollution in our oceans! And I love that they are so elegant!!! I love them so much that I keep buying sets to give as gifts to family and friends!!! But I do wish the lids for the larger containers fit tighter - one does have to be careful to not spill when putting them in the freezer.