Tourmaline Magnetic Therapy Lower Back Support Belt Self Heating Backache Features: 1. Self heating tourmaline magnetic therapy 2. Thin and breathable material, convenient and comfortable 3. Promote blood circulation, improve the metabolism, ease pain and keep warm, correct posture Description: Item Type: Tourmaline Magnetic Belt Color: As the pictures shown Sizes: S: 25-30" ; M: 31-35"; L: 36-41"; XL: 41-45" Package Included: 1 X Tourmaline Magnetic Belt Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness 2. Please allow slight deviation for the measurement data