Features: The back belt can be easily stored in a bag. The self-heating back belt is safe and has no side effects. The elastic heat belt is suitable for drivers, office workers, athletes, the elderly, women, and other individuals. It uses traditional Chinese medicine principles to provide continuous warmth through heat compression. This product makes a thoughtful gift for friends, family members, or colleagues during holidays such as Christmas. Specifications: Component: Derong Color: 5 options available Type: 2 options available Size: Medium / Large / XL / XXL (Chinese sizing, please refer to the size chart for selection) Size M: Height: 25 cm (9.84 inches) Width: 20 cm (7.87 inches) Waist: 57–70 cm (22.44–27.56 inches) Size L: Height: 25 cm (9.84 inches) Width: 23 cm (9.06 inches) Waist: 70–80 cm (27.56–31.50 inches) Size XL: Height: 25 cm (9.84 inches) Width: 27 cm (10.63 inches) Waist: 80–100 cm (31.50–39.37 inches) Size XXL: Height: 25 cm (9.84 inches) Width: 30 cm (11.81 inches) Waist: 100–123 cm (39.37–48.43 inches) Package Includes: 1 piece warm waistband Note: Please allow 1–3 cm measurement variation due to manual measurement. Due to differences between monitor displays, the actual color may vary slightly from the image.