The Simple Modern Trek Tumbler is double walled and vacuum insulated to keep your drink hot or cold for hours. The cup is outfitted with an ergonomic handle, that is aesthetically designed for comfort. It comes with a straw lid and removeable straw so you can enjoy your favorite beverage on the go. The straw lid is four-way threaded to allow four different straw placements for your drinking hand preference. •Vacuum Insulated: The Simple Modern Voyager mugs are double-walled and vacuum insulated, which keeps your favorite beverage hot or cold for hours •Insulated Flip Lid Included: The internally threaded flip lid is leak proof, making this cup great for hot or cold beverages at home or on the go •Premium 18/8 Stainless Steel: Mug is made from high-quality, food-grade 18/8 stainless steel and is coated in a durable finish •Premium Copper Coated Insulation Layer: The exterior of the inner wall, in the vacuum sealed area, is coated in copper for additional insulation