This bottle features our vacuum TriMax® triple insulation technology and has been tested to keep liquids cold for 36 hours and warm up to 8 hours. Its straw-top lid and leak-proof and spill-proof, and is designed for kids ages 4 and over. A versatile vessel for anything, anytime, anyplace and now available with interchangeable tops! WARNING: Spout could pose a choking hazard if chewed, bitten or comes off. Please check the spout every time it is used to make sure there are no rips or tears and it is securely attached. DO NOT USE if there is any damage to the spout.