Vacuum Insulated: The Simple Modern Cruiser tumbler is double wall and vacuum insulated. This technology keeps your beverage hot or cold for hours. No need for coasters or koozies, the exterior of the tumbler will never sweat or be hot to the touch. Don't worry about getting water on your desk, rings on your table, or burning your hand on the exterior! Specific details for each size are listed in the description and the featured photos. 18/8 Stainless Steel: This insulated cup is made from premium gauge 18/8 stainless steel. This FDA approved tumbler will never rust or leave a bad metal taste in your mouth. Flip Lid with 2 Straws: Rress in the flip lid to the top of your tumbler, the opening closes to create a splash proof seal. Two BPA free, reusable, plastic straws are included. The lid is dishwasher safe. Cupholder Friendly: All sizes of the Cruiser and Slim Cruiser fit most cupholders. The lid has an easy drinking opening to that does not close. Premium Copper Coated Insulation: The exterior of the inner wall, in the vacuum sealed area, has been dipped in copper for added insulation. Copper reduces the transfer of temperature, adding even more insulation to your tumbler. Easy to Clean: These tumblers have wide openings, making for easy cleaning. Hand washing is recommended for the tumbler, the Simple Modern bottle brush is recommended for scrubbing the inside of the cup. The lid is dishwasher safe. Why Simple Modern? The S|M logo stands for more than premium drinkware. At our core, we believe that relationships are more valuable than profit. Generosity is one of our two core company values. We give a minimum of 10% of our profit away and have been able to donate product to natural disaster causes. Simple Modern products are all reusable, reducing waste in our landfills. Our products are designed to simplify your life, empowering you to be a positive impact on the people around you.