Product details Enjoy your favorite hot or cold beverage on the go with the Mainstays Water Tumbler. This 30 fluid ounce tumbler is double walled and insulated contents. Whether you want to keep drinks cold in the summer or hot in the winter, the insulating features will keep your drinks the ideal temperature. The double wall construction will also ensure that your water bottle doesn’t sweat. HYDRATE ALL DAY: This large travel tumbler with lid and straw can hold 30 oz of your favorite beverage; This water cup is perfect for water, smoothies, iced coffee or iced tea. STAYS COLD ALL DAY: The double-wall vacuum insulation and durable 18/8 stainless steel construction keep drinks ice cold all day. DURABLE: This travel mug has a matching straw and 2-in-1 lid design that lets you sip drink or gulp. CONVENIENT: 30 oz mug fits in most cupholders. Perfect for in the car or exercise equipment. Wide mouth is easy to clean and dishwasher safe