NUK Insulated Cup-like Rim Sippy Cups, 2-Pack, are great for keeping your little one hydrated on the go! The double-walled cup's insulation will keep drinks nice and cool for up to 5 hours. Completely leak-proof and spill-proof, the bite-resistant flat rims will help your little one develop independent drinking skills. Plus, these 9 oz. cups come in a convenient 2-pack with fun designs your kid will love. And you will love that the cups are BPA-free and dishwasher-safe.