Ideal for stomach & back aches, joint pain, muscular cramps, menstrual pain, muscle pull, arthiritic and rheumatic pain Non-electric Water Bag. Ideal for Men & Women. Leak Proof Feature Usage Instructions: Add hot water, close the cap. Used for heat therapy Material: Rubber, unlike other unreliable water bags, its can resist the hot water pressure comfortably Instruction : Not suitable for children under the age of 36 months. Handing should always be carried out by an adult. Check stopper for wear and tear damage at regular intervals. Hot water bottle can cause burns- avoid prolonged direct contact to skin.