Waist Size:M 82-98 cm (32.3"-35.6") L 85-106 cm (34.5"-41.7")XL 87-107 cm (34.3"-42") Tourmaline is a natural mineral which produces far infrared rays and negative ions, when the tourmaline is placed on or near the skin it increases blood circulation to that area creating the natural heating effect. Before use, put the white part of belt wet. Suitable for: protrusion of lumbar vertebral disc, sciatica, waist need keeping warm, sitting for a long time, such as drivers or office workers, athletes or people doing regular exercise. Depending on the person, the tourmaline belt will fever after rt after took only 5 to 20 minutes and will keep working when close contact skin. The heating effect can be sped up by moistening the tourmaline beads with a damp.
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