The coffee cups are designed with sleek lines and the handlefree design allows for easy stacking facilitating convenient storage Crafted from heatresistant borosilicate glass our comsaf clear glass coffee cups are built to last Made of mouthblown borosilicate glass known for its insulating qualities Double walled to keep drinks cold or hot for longer Eat resistant glass A large coffee mug needs a big handle one thats comfortable with a wide opening and a thick stem that is perfect for sleepy or shaky hands These insulated mugs are easy to care for dishwashersafe and lightweight The doublewall glass coffee mugs allow you to enjoy your hot drinks without burning your fingers or sipping your iced ones without condensation on the outside