The NUK® Blue's Clues™ Hide 'n Seek Hard Spout Sippy Cup, 2-Pack, has a surprise in store for your little one: a game of hide-and-seek with their favorite pup, Blue! Fill the cup with cool liquid to make Blue's paw prints hide, then watch clues magically reappear with baby's warm touch. Refill it to play again! These easy-grip sippy cups feature durable, bite-resistant hard spouts that can withstand your toddler's teeth. Their one-piece, flow-control valves make drinking easy and mess-free, and they're removable and easy to clean. You'll also love that these Blue's Clues cups are 100% leak-proof and spill-proof, BPA-free, and dishwasher-safe. Staying hydrated has never been so much fun!