Ceramic inner layer and stainless steel outer reusable cup.Available in 3 sizes.'Our cups and bottles are curved to fit comfortably in your hand. They’re made of premium, safe materials. They boast one-of-a-kind built-in technology, including our game changing frank green Pay - enabled by Visa payWave so you can pay for your daily caffeine hit with a simple wave. They’re recyclable at end of life. They’re customisable to suit your personality so you can make them as individual as you are.'