Quality material provides an excellent drinking experience: The 16 oz ceramic mug is essentially a solid ceramic mug with stainless steel outer shell, not a thin coating ceramic that will chip or rust over time. The outer shell is rugged 18/8 stainless steel, wrap with a protective silicone sleeve and nonslip bottom base. The whole mug is an all-ceramic structure; Not only is the mug made out of ceramic, but the interior of the lid is also full ceramic. Further, you can remove the sealing ring for thorough cleaning. This mug is not an insulator thermos. If you mainly drink your coffee or tea at your desk, if you'd like to drink your beverage within the first hour, if you'd like a mug that cleans easily and is 100% safe, and you'd like the best taste possible, this is the mug.