The double-wall vacuum insulation will keep your hot drinks hot and your cold drinks cold far longer than standard mugs or cocktail glasses. And unlike your favorite bourbon glass, this lowball will never shatter on impact or leave a ring on your coffee table thanks to its 18/8 stainless steel construction and No Sweat Design. Taking your beverage to go? Pop on the optional Rambler 10/20oz lid to avoid splashing your beverage. Dishwasher safe.