The principle of the belt is based on thermotherapy or the treatment of pain with heat. It wraps and retains body heat to soothe low back pain. Composed of merino wool to retain heat naturally and modal fibre, products of natural origin, soft, breathable and comfortable. In addition, this breathable fibre allows a good evacuation of moisture. The heat treatment in thermotherapy allows bringing a feeling of relaxation and well-being because the latter will dilate the blood vessels to cause an influx of blood in the heated area. In addition to this natural thermal back treatment, the lumbar belt helps to ensure a good posture to better relieve pain.. *For hygiene reasons, we do not accept returns for this product after it has been opened. It can only be returned if the seal is still intact and the packaging has not been manipulated.