Leak-Proof: Learning how to drink from a cup doesn't have to be messy. Specially engineered valve means your child's drink will never spill (even when they turn their bottle upside down or shake it) Measurement Markers: Ensure your child is staying hydrated by monitoring the ...Leak-Proof: Learning how to drink from a cup doesn't have to be messy. Specially engineered valve means your child's drink will never spill (even when they turn their bottle upside down or shake it) Measurement Markers: Ensure your child is staying hydrated by monitoring the measurement markers on the sides of the cup, allowing you to clearly see how much they've had to drink Soft Weighted Silicone Straw: Allows child to drink from any angle for an easy transition from bottle to cup from 6 months onwards Easy Grip Handles: Make hydration a breeze with handles that are comfortable to hold and lift as they learn new drinking skills Baby Safe And Easy To Clean: All pieces are dishwasher safe and BPA free with your child's safety in mind