The La Cafetiere set of 2 double walled irish coffee mugs are perfect for a warming and delicious drink that is kept warmer for longer with the insulated construction. Made from borosilicate glass which is heat resistant and durable, these double walled mugs are perfect for serving a smooth a delicious irish coffee. The set of 2 double walled mugs are dishwasher safe for easy and convenient cleaning. Each mug has a 275ml / 0.5 pints / 9 fl oz capacity and come complete with a 12 month manufacturers guarantee.