On a standard roller coaster, the rider is held in their seat by some form of harness, such as a lap bar or an over-the-shoulder restraint. As stand-up roller coasters, by their design, do not have "seats," the harness system must both restrain and support the rider. Typical stand-up roller coaster harnesses are mounted on vertical posts, which allow the harness to adjust to riders of different heights. At the bottom is a seat resembling that on a bicycle, while at the top is an over-the-shoulder harness. TOGO models normally use a lap bar to further secure riders, while B&M models add a seat belt to connect the bicycle seat to the shoulder harness.