What is a Wispa bar? The package says " Aerated Cadbury milk chocolate bar." We like to imagine a milk chocolate covered chocolate Jacuzzi. The Wispa is made of chocolate infused with tiny bubbles and covered in smooth milk chocolate. What's the big deal about bubbles in chocolate? It turns out that bubbles in chocolate make it taste even smoother and creamier than solid chocolate and the smaller the bubbles, the better. Cadbury boasts that the Wispa has the tiniest bubbles and the biggest taste. Who are we to argue?