Savor your coffee or tea on a cheerful note in the Double Wall Ribbed Blue mug. Two layers of lightweight borosilicate glass are mouth blown together to create a unique glass-in-glass effect. The result is a vacuum layer of thermal insulation that either keeps drinks hot and easy to handle or preserves the cold in your drinks without wet condensation. The beautiful design of the stripes on the outer layer and color on the inside layer, gives the mug an added dimension of chic beauty. Also, a great gift idea for your loved ones or just a fun purchase for yourself.