Description: Material: Magnet, composite fabric, heating fabric Sizes: S(90cm*14cm), M(105cm*14cm), L(110cm*14cm), XL(115cm*14cm) Color: Black Features: 1. Self-heating material effectively promotes blood circulation in the waist, relieving lumbar fatigue and pain after prolonged sitting or exercise. 2. Highly elastic and breathable side straps conform to your body curves, providing all-day comfort and suitable for yoga, fitness, and other activities. 3. Double-pull side straps are adjustable for varying waist sizes, enhancing support and stability while protecting the lumbar spine from deformation. 4. Widened and thickened lumbar support belt provides professional-grade lumbar support, perfect for office workers and fitness enthusiasts. 5. Ergonomic design, lightweight and easy to use, suitable for long-term wear, improving quality of life. Comments: 1. Manual measurement tolerance is 2-5g. Please do not mind any substitutions. 2. Due to differences between monitors, images may not reflect the actual color of the item. Thank you very much! 3. SKU color refers to the color of the product packaging. Package Includes: 1 * Self-heating Belt