Excellent Temperature Retention Design: The bulk cups keep your on-the-go beverages hot for three hours or cold for nine hours, perfect for daily use. Premium Material: Travel mugs are made of 304 stainless steel. Electro polished inside. Ensure your cups unbreakable, rust resistant , sweat free ,Non-toxic and harmless.giving you a clean tasting drink every time! Fits Most Cup Holders: Travel Mug lightweight and compact feel make it easy to fit into most car cup holders. Carry around your beverages whether home, office, picnic, hiking or camping adventures. Multifunction: Thermal coffee mug with the wide mouth opening is easy to fill with ice cubes, can be stored a variety of liquids, such as water, coffee and other cold and hot drinks, to meet your needs.