Take your own belt and use their weights. Hire belts can often be too long or worse too short, buckles that stick or jam, furry webbing that's way too slack. have creases where weights have been all the time, no retainers of any sort so lead migrates or lead whacked on so it doesn't move, but is in the wrong place. Take your own belt, it's the right length and with a few retainers can have the lumps just where you want. Can also use a pouch belt that you can add lumps or shot too on site. These are wider so can grip a bit better if you have no hips.