Adjustable Back Support Posture Corrector and Shoulder Belt – Size: S: 18-27 inches – M: 27-36 inches – L: 37-45 inches – XL: 48-59 inches – Weight: 74g (approx.), Reinforced with nylon wire, firm and durable, High-quality Velcro – Sweat-absorbent and moisture-permeable mesh design, light thin fabric, covered with air holes, for better heat dissipation.