Hydro Flask® Travel Bottle with Flex Straw Cap 32oz features Temp Shield®? double-wall vacuum insulation keeps drinks cold up to 24 hours., Made with 18/8 pro-grade stainless steel for durability, powder coated BPA-Free, this straw cap is not intended for hot liquids. Pure taste and no flavor transfer Insulated Flex Straw Cap is leakproof when closed Handwash only