Stainless steel, insulated, reusable, and sized for epic daysour 40 oz Wide Mouth water bottle is the flask to grab to keep cold drinks cold and hot ones hot. The large opening makes it easy to add iceand get yourself a bigger gulp. Fill up for adventure.Specifications: TempShield double-wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12 Flex Cap is leakproof when closed Honeycomb Insulated Cap for maximum temperature retention Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer Color Last powder coat is durable, sweat-free and colorful Wide Mouth opening is ice-cube friendly Bottle fits most backcountry water filters BPA-Free Dishwasher safe Not for use on a stove, in a microwave or freezer