Harbinger 4" Pro Nylon Lifting Belt Product Guide 4 inch wide heavy duty nylon belt with a 3 inch support strap overlay for maximum lower back and abdominal protection during lifting. Thick, flexible, heavy duty nylon webbing provides maximum comfort and durability while maintaining muscle warmth. Heavy gauge steel roller buckle makes tensioning easy. WAIST SIZE (in inches) 26"-34" 30"-38" WAIST SIZE (in centimeters) 66-86cm (Medium) 76-97cm (Large)