A cool sippy cup that grows with your child. Have the pick of the Sip litter and choose between a soft spout for those new to the sippy cup world or a firm spout for the pros. And unlike the potential for a big spill with a regular cup, Boon can tell you there's nothing scary about Boon's leak resistant spouts. Your child can enjoy the beverage of his or her choice in 2 different colors and sizes, plus, mix and match tops and lids; they're all interchangeable. We'll totally drink to that.