The water bottle is made of 100% BPA free FDA silicone which is safe and healthy. It is ultra tough,durable and unbreakable, with leak-proof and spill-proof cap. The special material makes it easy to carry without taking up much space. It is perfect for any season, protecting your hands from being burned in summer,and can be used as a hand warmer in winter. You can customize your logo or company name on it for promotional purposes.