Back & Lumbar Support Cushions Adjustable Waist Nature Tourmaline Self heating Magnetic Therapy Waist Support Belt Lumbar Brace Massage Band High elastic fiber cloth, fine texture, soft handle. Vented and breathable elastic side panels. Adjustable Neoprene double pull braces. Nano infrared thermal acupuncture dot matrix, heating quickly, lasting effect. Magnetic therapy increase blood flow and help relieve pain associated with joint and back problems. Magnetic heating effect helping to relax muscles and reduces fatigue. Supporting the waist, maintain a good posture so that have some effects on lose fat and keep slim in some way Suit for: Athletes or people doing regular exercise. People who always work sedentarily or in a prolonged standing position such as drivers or office workers. People whose waist need keeping warm. (Recommend worn it under thin garment) People who has health problem like protrusion of lumbar vertebral disc, sciatica and / or lumbar hyperosteogeny. Specifications: Brand: GOBYGO Material: Tourmaline Color: Black Size: S/M/L/XL S: Length about 100cm,Suit for waist circumference 60-73cm M: Length about 105cm,Suit for waist circumference 74-87cm L: Length about 110cm,Suit for waist circumference 88-100cm XL: Length about 115cm,Suit for waist circumference 101-113cm