What exactly is a tea cozy? A fair question to be sure. A tea cozy, or cosy as the British spell it, is simply a cover for a teapot to keep the tea warm for longer periods than unprotected teapots. A well made tea cozy will keep tea hot and fresh tasting for about three hours. Tea cozies are beautiful and add fashion to any kitchen, dining room or tea corner. Tea cozies can coordinate with any decorating style and a collection of cozies can reflect seasons and celebrations.