The First Years Insulated Straw Cups with Magical Color Change are a hit with moms and kids! Our lid is designed to keep the straw clean when the cup is not in use. A simple movement on the lid hides the straw from the elements. 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.