Feature Description Freezer & Refrigerator Safe Opal Glass Tempered opal glass bowl withstands freezer and fridge temperatures without cracking, warping, or turning brittle. Freezer to Microwave in One Bowl Thermal shock resistant design lets you go from freezer to microwave to table—no need to switch containers. Non-Porous Surface for Fresh Food Storage Smooth opal glass blocks odor and stain absorption, keeping meal prep and leftovers fresh during cold storage.