1. Double Wall Vacuum Insulation: Keep ice cubes for 12 hours at room temperature until the ice is completely melted, or hot coffee for 6 hours. You have to fill them up to get 30 oz. 2. LIFETIME DURABLE - 18/8 food grade stainless steel body, BPA free, healthier than plastic cups. The insulated glass won't sweat due to the vacuum insulated design. The powder coating on the outside fits your hand better, looks good, and is non-slip. 3. SUITABLE FOR EVERY OCCASION - The vacuum travel mug is perfect for outdoor adventures, road trips, sporting events and is also the perfect travel mug to take coffee from home to work or fill up a drink before bed and drink it all night. 4.Easy to clean: It is recommended to wash by hand, the inside of electropolishing will not transfer the taste and there is no metallic aftertaste, you don't have to worry about the morning coffee or afternoon tea being spoiled." Item NO.15019351