Thermal bag designed to promote the relief of muscle discomfort or fatigue. It contains a natural clay filling, which helps to soothe pain and relax the body. It is suitable for cold application, for cases of inflammations and bruises. It can also be heated to help reduce joint stiffness and digestive discomfort. It comes with a very soft and pleasant to the touch skin coating. It comes with a strap to adjust around the knee, ankle, elbow, arm if necessary.