Definitely helps me. I don't ride my dirt bike without it. Buy a good one. Mine are not really padded but they have support top to bottom to help keep you straight. They work much better than those drug store back support belts, or even the lifting belts sold at home centers. Mine were $20-$30. Go somewhere to try them out and wear the type of clothing that you will wear it with.
Here is a good place to shop they normally have a large in store selection, much more than is on their web site
2225 Dixie Hwy