for waist or abdominal Function The built-in mineral materials and the mixed micro-materials that have infrared and wet heat effect can speed up the blood flow at each part, improving regional metabolism and microcirculation. It can quickly eliminate or relieve the soreness and wet cold symptoms at each joint and muscle. Applicable Symptoms Soreness at cervical vertebrae and lumbar vertebrae; soreness and heavy Feeling at shoulder, back, elbow, wrist and foot; knee joint soreness; strain of lumbar muscles; puerperal infection, dysmenorrhea; etc Applicable Population Those who spend long time in operating computers, doing homewrok and driving cars, brain workers, manual workers, middle and old age people. Usage: Heat the bag in the microwave oven for around 1-2 minutes, and then apply the bag at your neck, back, shoulder, waist, keen, muscle or where you feel pains. Cautions: The coat of this product is 100% pure cotton fabrics. Do not heat the bag in the microwave oven over 2 minutes. Long time heating of the bag in the microwave oven may cause scald when touching the skin directly. If the temperature of the bag is too high, place the bag aside and let it cool down to a suitable temperature before use.