About the skl double wall glassesnamed after the danish word for cheers! the skl double wall glasses are ideal whether youre celebrating a special occasion or simply raising a toast to good times. These glasses are perfect for serving everything from beer, cider, whiskey, champagne, juice and cocktails, to coffee, tea and hot cocoa.individually mouth-blown from heat-resistant borosilicate glass, skl double wall glasses keep hot and cold drinks at their optimum temperature for longer. A clever silicone vent at the base of the glass regulates its external temperature, so you dont need to worry about scalded fingers or messy condensation rings. These versatile glasses can also be used for serving warming soup or a chilled dessert. Whatever you serve inside them is sure to look a treat thanks to their innovative double wall design, which makes their contents appear as though suspended gracefully in the glass. Main features benefitsdouble wall glassesinnovative double wall design that keeps hot drinks hot and cold drinks coldalso perfect for serving soup or cold dessertsmade of mouth-blown, heat-resistant borosilicate glasshydrophobic silicone vent that equalizes the air pressure between the two layers of glassdishwasher, freezer, microwave and oven safe up to 350f176cuse carewash in warm, soapy water before first use and dry thoroughly. For all subsequent uses, wash and dry by hand or pop in the dishwasher. Skl glasses are safe to use in the freezer, oven and microwave.