THERMOS vacuum insulation technology for maximum temperature retention, not for use with hot liquids Durable stainless steel interior and exterior Hygienic push button lid with pop-up straw and integrated carry handle Keeps cold 12 hours; For maximum thermal efficiency, prechill beverage bottle prior to use. Fill with cold tap water, attach lid, let stand 5 to 10 minutes and empty. 12 ounce capacity; hand washing recommended