Choosing a 3 or 4 inch powerlifting belt depends on your needs and goals.If you're a first-time lifter, larger individual, or competitive powerlifter, the wider range of suitable exercise uses and increased core and back support offered may make the 4-inch belt a better choice. Whilst not as commonly used, a 3 inch powerlifting belt is a worthwhile investment in some cases. If you're a smaller lifter with a shorter torso, a bench press specialist, or simply feel you need more flexibility, a 3-inch belt is the way to go.