Keep your toddler’s drink cool everyday adventures with First Essentials by NUK Insulated cup-like rim cups.The cup features a unique bite- resistant, flat rim designed to help teach your toddler the motions of drinking from a spoutless cup. The cup includes Arctic Wrap Insulation, keeping drinks cool for up to 6 hours, This 9-ounce sippy cup is 100 % leak-proof and spill-proof.