This double-walled martini glass was developed to optimize the cocktail experience through a high-quality choice of materials and functional design. Made from durable borosilicate glass and fitted with an elegant silicone stopper, it adds a sophisticated touch to any cocktail presentation. The double-walled construction provides an elegant look and helps to maintain the temperature of the drink. Before first use, clean with warm soapy water and dry thoroughly. For all subsequent uses, the glass can be cleaned by hand or washed in the dishwasher.