Avanti Oko Twin Wall Mug 2pc Set 250ml You can now easily enjoy a comforting warm mug of hot chocolate with roasted marshmallows on a cold day in the Avanti Oko Twin Wall Mug without burning your hands! These Avanti Oko Twin Wall Mugs are cleverly constructed from double-wall insulated borosilicate glass to keep your drinks warm or cool for a longer duration, without leaving condensation marks on your table. Thanks to this clever construction, you can rest assured that your hands will never be burnt by the cup's exterior.