Drink, sip or gulp: This tumbler is designed to grow with your child. The clever 3-in-1 lid allows you to choose whether they drink from the straw, sip through the lid or gulp from an open cup Leak and shake proof straw: Our unique anti-leak technology guarantees that when in straw position, this cup is 100% leak proof, even when it’s turned upside down or shaken Lockable lid: When you align the lid with the closed padlock symbol, your cup is completely spill-proof so there are no leaks when on the go Bite-resistant: Durable yet soft at the same time, the straw is made from bite-resistant material that’s gentle on little mouths, but can withstand tiny teeth Double wall insulated: The insulated base keeps drinks cold to encourage little ones to stay hydrated and helps them keep cool while playing