Made of 100% food grade silicone passed FDA, LFGB test, durable and flexible enough to folding, foldable drink bottle are Non-toxic, BPA free and safe.Endure -60 to 200 Celsius, Great for hot and cold beverages, you can freeze or microwave it. It retains its shape and never releases harmful chemicals.You can freeze it and use it as an ice pack when you get hurt or have a fever: or put hot water in, it can be used as hot pack too.It can be used as a mini pillow when you have a long flight.Perfect for work, school, gym, running, hiking, biking, boating.Easy to wash and carry, dishwasher safe.