There's a reason that this 20 oz. Hugo Copper Vacuum Insulated Tumbler is so popular. The double-wall stainless steel vacuum has a high-caliber look and the copper insulation does a fantastic job of keeping your drinks the way they were when you poured them. Hot beverages stay hot for at least 6 hours while cold drinks stay cold for 24 hours. Your grip won't slip because the construction prevents condensation. The push-on lid allows for easy sipping. Hand was recommended.