Advanced Vacuum Insulation Technology! James Dewar invented the first vacuum flask in 1892. Double walls mean that the inside liquid compartment is protected from the heat or cold of the outside. Hot or cold drinks are insulated and will hold their temperature for longer. Keep hot/warm drinks for 12 hours and cold drinks for 6 hours. Best Choice to Carry Your Coffee! MAVIE Vacuum Insulated Mug fits two regular coffees for you. It keeps your coffee hot after a day. CONVENIENT ONE-CLICK OPERATION - Our travel mugs are constructed in an easy, 'one-hand operation' style. To open the lid, simply hold your mug in one hand, release the safety lock and press the button with your thumb. Product Specifics: Brand: MAVIE Product Dimensions: 7.3cm*7.3cm*24cm Capacity: 16OZ. / 450ML Body Material: 18/8 & 304 stainless steel Lid Material: Food-grade silicone Keep warm drinks: >60℃ in 12 hours; >72℃ in 6 hours Keep cold drinks: Cold liquids stay cold for 6 hours Overall Features & Benefits: 1. Stainless steel double walled vacuum insulated flask 2. 450ml capacity, lightweight and 100% leak proof 3. Wide mouth, easy-flip press button lid and anti-hot sipping design 4. Lid locks to prevent accidental spills 5. One handed operation for on-the-go drinking 6. Keeps hot for up to 12 hours and cold for up to 6 hours 7. Fits most car cup holders 8. Great gift for men & women Box Contains: 1 X Stainless Steel Mug