The First Years Insulated Sippy Cups with Magical Color Change are a hit with moms and kids! Moms love the easy clean valve system that is built into the lid. It's easy to clean and there are no small parts to lose at daycare or go down the garbage disposal. Not to mention, the cups are dishwasher safe and BPA free! Kids have fun watching the color magically change when a drink is poured into it, while Mom has the peace of mind knowing when the drink reaches room temperature. The cup is designed to be easy for children to hold and the double wall insulation prevents the cup from sweating.