Turn your iPhone case into your own work of art. The Thermo Snap case changes color when it's hot or cold. Rub it with your finger to draw a doodle or write a message. If you really want to show your love, give it a kiss to warm it up. When the case cools down it changes back to the original color. You get the same durable hardshell protection of our standard Snap Case, while the minimalist design maintains the elegant profile of the iPhone 4 and doesn't obstruct any buttons or ports.