*PAIN RELIEVERS & ESSENTIAL HOME REMEDY: Treating sore muscles, stress, migraines, cramps, arthritis, aches and pains, stiff necks, lower back pain, menstrual cramps and tension, can also double up as a cold compress for kids or travel/camping *EASY TO USE- Wide mouth is easy to fill and the anti spurt lip prevent water spitting back out like those old rubber ones. Fill only to two-thirds capacity maximum. It's transparent. No more guesswork about how much hot water is inside. *DURABLE & SAFE TO USE: Transparent bottle to accurately know how much water is inside. Made with thicken PVC material and designed for anti-explosion which can withstand more than 1000Ib of pressure, rest assured that you will not get burned, odorless thermoplastic material, TUV approved .Thicker than rubber hot water bottles , but keeps the water warm for a longer period of time,But please CAUTION: The hot water bottle rubber is not suitable for Microwave oven heating.