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. 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. This product is not dishwasher safe but the wide mouth makes it easy to clean. Two Lids Included: All Summit bottles in this listing come with our Stainless Steel Lid and leak proof Flip Lid. The Flip Lid is ideal for coffee and tea. The Stainless Steel Lid connects to the neck of the bottle, great for taking cold water with you. 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. Wide Mouth: The Summit wide mouth opening is designed for easily filling with ice and larger quantities of liquid. Cleaning is made easy by the wide mouth. The the wide mouth opening is the same size for every size of Summit bottle. This means all of our great Summit lids will fit your Summit bottle!