The double wall, vacuum insulated body reduces condensation and allows drinks to stay cold for up to 24 hours hot up to 12 hours. Featuring a tight fitting twist cap silicone seal, ensure no leaks. Bpa free. Easy to clean. Made to last a lifetime. Eco friendly. Made from high grade 188 stainless steel. Wash in hot soapy water prior to first use and rinse thoroughly. Hand wash recommended.