Classy, sleek, and thoughtfully designed, the Aspen Travel Mug offers a cool look with practical features you'll appreciate the more you use it. It will keep your drinks cold for up to 80 hours and hot for up to 16 hours. Its thermal properties can't be matched by any other bottle. It is made with internal threading so it opens and closes quickly and easily with just a one and a half twist. With the internal threading, the rim is smooth for comfortable drinking and easy cleaning. This versatile bottle is ideal for any drink, from cold water to hot coffee.