The cervical hot water bottle is filled with flax seeds, cherry pits, and a bit of lavender for a relaxing effect. Ideal for relieving muscle pain, aches, menstrual pain... or simply to warm up. Usage: Gradually heat the hot water bottle in the microwave to the desired temperature. In 30-second intervals, turning it over between each heating. Occasionally place a glass of water in the microwave with the hot water bottle to prevent the seeds from drying out. Dimensions: Approximately 28x18cm Washing: Only the cover is machine washable at 40°C.