This 20oz insulated stainless steel tumbler keeps your favorite drink ice cold or steaming hot for hours. Double Wall Vacuum Insulation - interior copper lining coating for exceptional temperature retention. Keeps Ice Longer - Preserves ice for up to 24 hours. Heat Retention - Keeps beverages hot for up to 6 hours. Air tight lid - BPA free, air tight lid locks in the cold / heat. Sweat-free Design - The outside stays dry. Super Grip - Threaded and tall base ensures superior grip. Cup Holder friendly - Fits in most vehicle cup holders.