Using a combination of ceramic and stainless steel, the cup-holder compatible Ceramic Reusable Cup is your sustainable option for keeping your favorite beverages close to their ideal temperature, whether hot or cold, for up to 12 hours. Its ceramic inner layer maintains flavor, while the 304 stainless steel renders shatterproof. Enjoy all your favorite beverages on the go with ease, thanks to the cup's push-button feature that lets you open and close with one hand.