The Boulder Insulated Bottle has been tested to keep water cold for up to 36 hours and hot up to 8 hours. Perfect for water, tea, coffee, soup or just about any drink. Its tight screw on top will keep your drink securely inside, where it belongs. It has a wide mouth to easily accommodate ice cubes. The Boulder is a sturdy, high quality, stylish vacuum insulated steel water bottle for the office, tennis court, golf course, on the trail... any place, any time. Free of BPA, phthalates, & liners. Recyclable.