Vacuum Insulated: The Simple Modern Summit 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. Straw Lid: All Summit bottles in this listing come with a straw lid. This straw lid is leakproof, with a nozzle the flips up for easy drinking. This lid is great for kids and adults at home or on the go. The opening on every Summit bottle is the same width so the same straw lid fits the size of the bottle. Powder Coated 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. 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. 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.