400ml Summer Water Bottle Safe and environmentally friendly materials, you can rest assured that children will use it safely. Our mugs are made of high-quality food-grade silicone. Extremely practical: Thermos bottle is extremely durable, lightweight and highly resistant to heat, cold and hot temperatures, making this a ideal choice for taking anywhere. Corrosion resistant: Corrosion resistant, not easy to deform or break, the product will keep you warm all day. Great gift choice: Exquisite workmanship, it is an excellent gift choice for family and friends.