Just twist off the clear outer sleeve and use the dry-erase marker included to write notes or doodle on the outer sleeve or the stainless steel tumbler. Perfect as a gift for yourself or a loved one (who will think of you every time they use it), the double-walled, insulating tumbler with flip-top lid helps keep hot beverages hot and cold liquids cold. Holds 16 fl oz. Hand wash only. Do not microwave.