The special mix of millet and lavender provides a sense of well being as well as a calming and relaxing effect. Ideal in helping to fall asleep better, they are a perfect alternative to hot water bottles and electric blankets thanks to their simple, quick and above all safe way of use. Their stuffing is 100% natural. The heat is long lasting and gradually released. They are heated in a microwave oven for only 90 seconds at 800 Watts. The heat is released in 90 minutes. The Warmies are also ideal to substitute ice packs for shooting swelling and distortions or in case of fever. Place them in a plastic bag and leave them in the freezer overnight.