18/8 Stainless Steel: This reusable bottle is made from premium gauge 18/8 stainless steel. This material is BPA-free and will never rust or leave a bad metal taste in your mouth. This product is not dishwasher safe but the wide mouth makes it easy to clean. 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: The Ascent's narrow mouth provides extra insulation. The opening of the bottle fits most ice cubes. Cupholder Friendly Sizes: The 12oz, 17oz, 20oz and 24oz Ascent bottles are cupholder friendly. The 32oz 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 products 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.