TempShield®️ double-wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12 Insulated Flex Straw Cap is leakproof when closed Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer Wide Mouth opening is ice-cube friendly Color Last™ powder coat stays clean and colorful Bottle fits most backcountry water filters BPA-Free Dishwasher safe Flex Straw Cap not intended for use with hot liquids Not for use on a stove, in a microwave or freezer