24 hours cold TempShield® double-wall vacuum insulation Leakproof when closed Fits most cupholders Pure taste, no flavor transfer Wide Mouth opening is ice cube friendly Dishwasher safe Durable stainless steel BPA-Free Flex Straw Cap not intended for use with hot liquids Not for use on a stove, in a microwave or freezer Bottle fits all Wide Mouth caps and lids