Hot Water Bottle: Biggdesign hot water bottles are made of advanced rubber, which is durable and not harmful to health. It has a leak-proof lid for people of all age groups to use safely. Dimensions: 8x14 in, 20x35 cm Capacity: 67 oz, 2 L Warm Up To 6-12 Hours: The heat lasts for up to 6 hours at room temperature and 7–12 hours in a warm bed. It retains heat well to stay warm for longer periods. Therefore, you can rest it on your body or use it to heat up the inside of your bed before sleeping. Super Soft Plush Cover: To provide the ultimate in warmth, this hot water bag comes with a cuddly ultra-soft plush cover in a special design. The soft cover makes it easy to hug close. It is also removable and machine washable. Instructions of Use: Before first use, fill your hot water bottle with hot water and wait for 2 hours. Then you can empty it and let it air dry for about 20 minutes. It is ready to use. For life-long use, use hot water up to 60 degrees. Do not use boiling water.