This product is a classic mood lifter that changes color when filled with cold ice. The mood stadium cup, as the name suggests, is made of durable plastic and reacts with cold liquids to change color up to where it's filled. These color changing cups not only add on-the-spot fun to your drinks but also give a unique sense of joy from witnessing the visual impressions of an ice cold drink. They are regarded as an entertaining drink accessory best used at birthdays, parties and office celebrations to fill cold soda, punch, and beer.