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This Polar Camel high endurance drinkware is engineered with double-wall, vacuum-insulated construction to provide superior heat and cold retention. It keeps ice for up to 24 hours and keeps drinks hot for up to 6 hours! These tumblers are not microwave safe or dishwasher safe. Holds 20oz of liquid. The leather engraving was produced by a local business that is owned and operated by Volunteer Firefighters. Support their work! Quality Trophies of Hudson, NY.