Body Building Belt Leather
In a nutshell, a lifting belt provides a wall for your abs to push against.
The added force with limited space means increased anterior pressure for the spine, helping to stabilize it.
This gives you a more rigid torso with better transmission of force from the hips to the bar, plus a more stable foundation for overhead lifts.
The width in the back of the belt has absolutely nothing to do with a belt’s function, as many people think.
Ideally, a belt between three-and-four-inches wide, all the way around, is sufficient.
If it’s much smaller than that, it won’t provide much support.
If it’s much larger than that, it may not fit well between your ribs and hips.
The material should be firm, typically leather/suede or something that won’t stretch.