The Potenza Fitness Classic Powerlifting Belt is hand-crafted from 100% genuine cowhide, ultra-durable, and naturally sweat resistant. Measuring 10mm in thickness and 4 inches (10 cm) wide, our leather belts protect you when you lift heavy. Sizing: Measure your waist around your belly button level while flexing your abs (not sucking in) Provide a firm surface for your abs to contract against. As you perform your lifts, brace your abs against the belt, and breathe in your belly pushing against your abs. The Potenza Fitness Classic Powerlifting belt is ideal for squatting, deadlifting, overhead pressing, doing log presses, and farmer s carries. Single prong for easy on and off.