This vacuum insulated cup with tea leaf filter is made of food-grade stainless steel on both inside and outside walls. Vacuum insulation creates an airless space between two walls which is virtually eliminating the convection process and temperature change. Double walled insulation maintains hot or cold temperature of contents for a long time. The unique texture design of the lid is retro. It's suitable for business, travel, work, school, home and other occasions. It's ideal for carrying a wide variety of beverages. Custom logo is available.