Fun and functional, our short tumblers have a double-walled design that make beverages appear to float dramatically within. The two walls of borosilicate glass create an insulating layer that keeps chilled cocktails and soft drinks cold, preventing heat transfer from your hand. The design also maintains the temperature of hot beverages while the glass remains cool to the touch, ideal for Irish coffee, hot toddies and espresso drinks. Made of superstrong yet lightweight borosilicate glass. Designed for hot and cold beverages. Will not become cloudy over time. Microwavable and dishwasher safe. 10-oz. cap. Set of four.