Superior Core and Lumbar Support: 4-inch (10cm) uniform width is the IPF and IWF competition standard, providing maximum surface area for bracing the core and stabilizing the spine during heavy compound lifts like Squats, Deadlifts, and Overhead Presses. Optimal 10mm Thickness: Offers the 'sweet spot' of support and comfort. Provides robust stability for heavy lifting, yet is more flexible and requires a shorter break-in period compared to stiffer 13mm belts. Ideal for beginner to advanced lifters. Heavy-Duty Adjustable Buckle: Features a precision-engineered, heavy-duty adjustable steel buckle (as shown in image) for a fast, secure, and consistent fit every time. The mechanism locks securely to maintain intra-abdominal pressure throughout your set. Precise Sizing for Perfect Fit: Available in three sizes to ensure a tailored fit for every athlete. Small: 24" - 30" | Medium: 28" - 34" | Large: 32" - 38"