This hot water bottle is an excellent product specifically designed for the Japanese market. Made of food-grade silicone, it is safe and reliable. With a large capacity of 1.1L, it can provide warmth for a long time. It is safe and explosion-proof, without the use of electricity. It can be heated in the microwave for a maximum of 3 minutes. It is especially suitable for people who feel cold easily, and it can warm the lower back during menstruation, effectively relieving discomfort caused by cold. The material is soft and comfortable to the touch. The washable design allows you to keep it clean and hygienic at all times. It comes with an insulated cover, which further enhances the heat retention effect and extends the duration of warmth. 2-45