Learning to drink independently is an important step in a baby's development. The NUK Evolution 360 spoutless cups allow baby to drink just like a big kid. Baby can drink from anywhere on the rim, just like an adult cup. Evolution 360 cup automatically seal when baby stops drinking, preventing any leaks. The 360 cup also come with a lid for on-the-go travel to help keep cup lid clean. The Evolution Cup base can be used with all three lid types, so you can easily transition between Learner, 360 and Straw as your baby grows.