• Patented valve and natural flow for an easy transition from the bottle. • Valve design that requires light suction to open, making it easy for little ones to sip. • Leak-proof valve that locks in place, even when dropped or thrown, and disassembles for easy cleaning. • Soft, comfortable, non-slip, and contoured handles, adjustable to help little ones control their drink. • Convenient measurement marks. • Leak-proof valve stays in place even when the cup is dropped or thrown. • The spout has a natural flow for an easy transition from bottle feeding. • The OXO Tot Transitions series features interchangeable cups and lids for easy transitions from baby to toddler to big kid.