For user's safety, water used should never be warmer than is comfortable to touch. Even hot tap water can cause burns.
Do not fold, sit or lie on bottle during use.
Do not expose bottle to direct sunlight or other heat.
Do not use the device on someone who is sleeping or unconscious, an infant, or a patient with altered mental status or decreased skin sensation (such as people with diabetes or compromised skin circulation). CAUTION: For application to sensitive skin areas, wrap soft cloth or towel around bottle. Recommended for single user only. Do not use microwave, conventional oven, or stovetop to heat vessel or water.
Keep out of reach of children as parts may present a choking hazard if placed in a child's mouth.