It is a dual purpose gel pack that can be used both hot and cold. Instructions for cold therapy: Cold therapy is used for both acute and chronic conditions such as musculoskeletal conditions. It helps to reduce swelling, inflammation and pain. Instructions for warm therapy: Warm therapy is recommended to alleviate pain and to reduce muscle spasms. It is indicated in lumbago and back pain back, menstrual pain, tension headache, blotchy, poor circulation, muscle numbness. To warm, boil enough water to cover the compress. Take the water off the heat and put the compress in the water for 4-5 min. Precautions: Use the product carefully so as not to cause tissue or nerve damage, especially in patients with diminished sense of touch. Do not use hot or cold compress when suffering of diseases in which such treatments are contraindicated. Caution: Do not use the product if it is damaged, always use the protective cover. Do not overheat the compress, do not use the classic or microwave oven to heat it. Do not continue using the product, whether hot or cold , when it causes discomfort. Box contents: 1 compress 26 cm x 11 cm, with cover