Made of Stainless Steel, this series of coffee mugs are vacuum double insulated, which brings 3+ hours heat preservation for hot drinks and 9+ hours for cold drinks.The BPA-FREE lid for this coffee tumbler can be detached easily while providing 100% leak proof.Besides, we provide two types of stainless steel straw and one clean brush for you.Powder coated, this insulated travel mug is sweat-free to grip. The classic no-handle design provides you with original experience of drinking coffee or tea.