Our Stainless Steel water bottles are made from 304 Stainless Steel and leak proof. It is vacuum insulated double wall stainless steel. WAICEE is created endurable to the hottest summers. This is the perfect bottle for beach lovers, travellers as well as kids. You are going to enjoy cool water even under the hottest sun. The ability to keep liquids warm for 12 hours allows carrying milk or tea for your baby effectively.