Built-in hinges allow mat to be flexible when frozen. * Sized to wrap around 6-can coolers, or even arms and legs for emergency medical use. * Lasts from 4 to 6 hours in lunch box. Use more than one to last even longer. * Made from super safe BPA-free plastic and purified treated water. * Colorful, kid-friendly design: Freezy the Penguin mascot graces the front of the product.