Vacuum Insulated: The Simple Modern Ascent water bottle is double wall and vacuum insulated. This technology keeps your beverage hot or cold for hours. Specific details for each size are listed in the description and the featured photos. No need for koozies or coasters! No matter the temperature of the liquid in this bottle, it will never sweat or be hot to the touch. Powder Coated 18/8 Stainless Steel: This reusable bottle is made from premium gage 18/8 stainless steel. This material is BPA free and will never rust or leave a bad metal taste in your mouth. Choose between the most popular and durable powder coated colors on the market. This product is not dishwasher safe but the wide mouth makes it easy to clean. Insulated Handle Lid: The lid that comes on the Ascent bottles has a handle, for comfortable carrying. The lid is double walled, adding more insulation to your beverage and preventing condensation. Internal threading on the narrow mouth Ascent lid makes for a more sleek bottle and more comfortable drinking. 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 bottle. Narrow Mouth Opening: The Ascent bottle has a narrow mouth opening, reducing spills and sloshing when drinking. The narrow opening increases the temperature retention qualities of the vessel. Ice fits through the opening, one at a time. Cupholder Friendly Sizes: The 12oz, 16oz, 20oz and 24oz Ascent bottles are cupholder friendly. The 32oz size is too wide to fit in cup holders. 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.