Tumbler Blue 600ml Nitori Opened but never used. ● Condensation-resistant, heat-resistant vacuum insulation ● Keeps flavor and temperature; ice melts slowly, so the taste doesn't get diluted easily ● This product has a double-walled stainless steel construction, with a vacuum between the inner and outer walls. This prevents heat from the outside from transferring to the inside, so it keeps both cold and hot drinks at the perfect temperature. 【Material】 Body: Stainless steel