- DOUBLE WALLED DESIGN：Insulated coffee mug keep the temperature of liquid hot or cold for a longer period of time while the outer glass wall remains comfortable to touch. Give a smooth finish and a crystal clear look, creating a nice feeling in hand CLEAR BOROSILICATE GLASS - lead free. Glass cups is make of mouth-blown borosilicate glass which is more durable than normal glass and is well known as the purest and safest material to contact with water. 2 layer with a smooth and clear look, your drink will seem to float in mid-air. GREAT CAPACITY - Each package with lid. You can cover the drink when you don\u2019t need it to avoid getting dirty. 450ml large capacity, meet all your needs. perfectly sized for espresso, tea, coffee, latte, mocha etc. For All Occasions: The clear coffee mug with high temperature resistance from -20~150℃/ -4~302°F . Cool to touch, without burning fingers. It\u2019s a perfect addition to your breakfast and afternoon teatime. Clear coffee mugs could be the ideal gift for your family or friends and Father's Day Gift. DISHWASHER SAFE- The pieces are dishwasher safe, allowing hassle free cleaning after use.In addition, we will offer a free replacement or refund if anything goes wrong with the product.