Beautifully designed, this Professional Stainless Steel Vacuum Thermos Cup makes brewing loose tea on-the-go simple and convenient! The innovative design allows you to brew tea (whether loose leaf tea or a tea bag) and stop the infusion process without having to remove the tea from the mug, preventing over-steeping! Keep your tea hot for hours with this tumbler. It is spill-proof and leak-resistant. Your beverage will stay hot for longer! Enjoy your tea on the go, in style!