Dual structure that superior heat retention and stress are free. I can drink it up without stress in smooth taste till the last.TRAVEL TUMBLER which carries one cup of feelings in a hand with a taste in temperature, the outdoor adjusting to fragrance, oneself rich Superior thermal insulation cold storage effect A bottle main unit is dual structure of the stainless steel. I prevent the heat radiation caused by the convection by making a vacuum state between the bottles in an outside bottle and show a high thermal insulation cold storage effect. More than thermal insulation 65 degrees Celsius, to hold cool 8 degrees Celsius or less six hours; refresh at temperature delicious anytime. Furthermore, trouble to open and close a cover whenever I drink even the state that took off a cover by the design that dust is hard to enter may not disturb work to cry.