Double wall vacuum insulated Leak-proof lid Condensation free Modern Wave 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 coasters! No matter the temperature of the liquid in this bottle, it will never sweat or be hot to the touch. Keeps liquid cold for 24 hours Keeps liquid hot for 12 hours Colorful 18/8 Stainless Steel – This insulated cup is made from premium gauge, rust resistant 18/8 stainless steel. We have chosen from the most popular colors, giving the container a vibrant finish. The solid colors have a subtle sparkle in the paint. This FDA approved bottle will never rust or leave a bad metal taste in your mouth. Leak Proof Lid, Narrow Mouth – The narrow mouth on the Wave bottle channels your beverage, to reduce spills and sloshing while you drink. Normal sized ice cubes will fit through the opening one at a time. The twist on lid provides a leak proof seal. This stainless steel lid is double wall insulated. The 20oz will fit a full bottle of fine.