Our Victory Color-changing Tumbler with Flip Top Lid is a quality and unique gift for your hard-working elementary school teachers, staff, and volunteers. The 16 oz. tumbler features double wall construction with a clear outer shell and an inner shell that changes color when filled with cold beverages. Add a one-color imprint to one side of the tumbler to customize it with a teacher appreciation message, holiday greeting, or your elementary school name and mascot. NOTE: Do not microwave. Hand wash only.