Silicone [Health and Safety Material] The collapsible water bottle is made of food-grade silicone (bottle body) and pp (bottle cap) materials. Our materials have passed the US Food Safety Certification (FDA) free of BPA and other harmful substances. Safety for a wide range of temperatures: -104F to 392F. In order to avoid burning, we recommend you don't use the bottle for liquid temperatures higher than 140F. [Leak-Proof and Easy-to-Clean] The collapsible water bottle has a silicone sealing ring to prevent water from splashing out. The bottle mouth is detachable, the wide neck detachable design makes the bottle easy to clean. Put ice and lemon in it, and the narrow mouth prevents leakage and wetting when drinking water. [Lightweight and Easy to Carry] In Foldable design, the volume of the water bottle is reduced by 50% after folding, leaving only 4.88 inches (height), which can be adjusted according to your needs. Comes with a carabiner for easy portability or attaching to a backpack, perfect for schools, workouts, offices, gyms, and outdoor recreations. [Durable and Reusable] This silicone water bottle can be used reusable, it is also anti-vibration and explosion-proof, you don't have to worry about it will be broken or scratched. Shatter-proof silicone body ensures you stay hydrated during your travels or activities for long time. A perfect gift for your littles on vacation and holiday!