Individually mouth-blown by expert artisans</br>Feature two walls of borosilicate glass?? creating a highly effective layer of insulation.?</br>Silicone valve at base allows for changes in pressure?</br>Also perfect for serving ice cream and soups?</br>Dishwasher?? microwave safe?? and oven safe (up to 350 DegreeF/176 DegreeC)</br></br>Product Description</br></br>The PILATUS 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.?</br><br/>http://www.amazon.com/gp/product/B00EOBD7C4