Avoid pain and incorrect postures with the Dr Gem magnetic back support! This posture corrector provides excellent support and includes 12 magnets (400 G) that are strategically located to reduce and avoid back pain. It's perfect to keep a correct posture, improve the blood flow and relax the muscles. Unisex. Made of breathable neoprene (45%), polyester (35%) and cotton (20%). With adjustable straps. The waist contour can be adjusted with a hook-and-loop fastener: 70-92 cm (M), 95-117 cm (L) and 102-124 cm (XL).