This dish is made with a premium glass design for high heat tolerance and durability. Were talking temperatures up to 550 degrees, and it can go from the oven straight to the fridge or freezer. Impressive, right?!  It’s break and chip-resistant, lightweight, and easy to clean. On the other hand... The lid is not air-tight and the dish is much more shallow than you would expect. Rubbermaid also has many restrictions on this dish that you should be aware of prior to purchase or using!