Generally, back braces are categorized as flexible, semi-rigid, and rigid. Rigid braces tend to be used for moderate to severe cases of pain and/or instability, such as to assist healing of spinal fractures or after back surgery. Semi-rigid and flexible braces are used for more mild or moderate pain.
Flexible lumbar belts or corsets typically come in a variety of sizes and designs. A corset brace looks similar to a woman's corset, and allows for some limited bending. Corsets typically include vertical metal or plastic stays at the front, back, and/or sides of the brace that provide stability and some motion restriction.