MULTI FUNCTIONAL HOT WATER BOTTLE - Our PVC bottles are made of a thermoplastic material that's both odorless and recyclable. The advanced thermoplastic material holds heat for hours longer than traditional rubber bottles, and also works as an ice pack or cold water bottle. Bring extra warmth anywhere you need it: in the bed, in the car, on a flight or bus ride, while camping or as a foot warmer anytime. EASY TO USE - The wide mouth makes it easy to fill the bottle and the anti-spurt lip prevents water from spitting back to reduce the risk of burns by hot water. Firmly grip the neck of the hot water bottle, slowly fill 2/3 full and press the residual air out slowly as you tighten the screw cap. Make sure there are no leaks before using. TRUSTED PAIN RELIEF - The classic design of this at-home remedy helps treat sore muscles, stress or cramps, arthritis, aches and pains, stiff necks, lower back pain, menstrual cramps and other common aches and can also double up as a cold compress for kids with fever or to reduce swelling for minor injuries.