A cupholder-compatible water bottle with our leakproof Flex Straw Cap-easy to fill, easy to drink. Open it up, add your ice, and flip to sip. The insulated stainless steel keeps it cold for up to 24 hours. 24 hours cold, 12 hours hot TempShieldA(R) double-wall vacuum insulation Insulated Flex Straw Cap is leakproof when closed Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer Fits most cupholders Color Last(TM) powder coat is durable, sweat-free and colorful 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