SIGG bottles are molded with 99.5% high purity quality aluminum plates with 600 tons of pressure. The body is completely seamless, lightweight and durable. The average wall thickness is 0.02 inches (0.65 mm) thin, and does not have heat or cold retention. The inside of the bottle is specially coated to resist the taste and odor of your drink. Wide Mouth is a wide mouth with a 48mm diameter bottle diameter. Drinking directly from the different cap on the top of the wide cap. The wide mouth makes it easy to fill ice cubes and clean the interior. The bottom of the bottle is indented by the manufacturing process and is attached to all SIGG bottles. It is not a problem with strength, so you can rest assured that you can use it.