The Bodum Pavina Double Wall Glasses keep hot drinks hot without burning fingers and cold drinks cold without messy condensation, making them the ideal vessels for every beverage, from cocktails to cocoa. Individually mouth-blown by expert artisans, Bodum's proprietary Double Wall Glasses feature two walls of borosilicate glass, creating a highly effective layer of insulation. Silicone valve at base allows for changes in pressure. Also perfect for serving ice cream and soups. Features set of 2 individual glasses. 0.35 liter capacity and medium in size.
Also available $4 cheaper ($15.95) @ https://www.amazon.com.au/gp/product/B00076ZD36/ put with delivery ETA of 9-19 Oct, instead of 18 Aug ($19.95)
Costco you can get 1/2 dozen for not much more.