This Made in USA spill-proof sippy cup is made to withstand every adventure. A rubberized lid and smooth mouthpiece ensure comfortable and safe sipping. Tested by toddlers, beloved by parents. Did you know all wide mouth lids are interchangeable? That’s right, the Nalgene bottle grows with you, allowing you to switch a Grip-n-Gulp lid for an OTF lock-top or Wide Mouth loop top whenever your child is ready.