1. High-quality 316L Stainless Steel, Resistant to Corrosion for Safe Use. 2. Transparent Drinking Spout and Water Bottle Body Made of Safe Tritan Material, the Same as Baby Bottles. 3. A safe tumbler that can be used immediately after simple cleaning, without the use of chemical abrasives. 4. Perfect sealing with a locking ring that prevents the one-touch button from automatically opening, ensuring safe use.