Wearing the shoulder belt in an unsafe manner leaves the passenger open to significant injury. With this product you wear your belt properly - tight on your lap, firm on your chest and center your shoulder bone.
It is a trifold. Wrap it around both the shoulder belt and lap belt in the lap belt area. Slide it along these belts and the shoulder belt moves slightly. It is now more off the ribs and more center to the entire spinal column.
The lap belt results in injuries to the abdomen and spinal cord. Spinal cord injuries are caused by violent movement that twists or pulls. Moving the shoulder belt more vertical puts it more aligned with the entire spinal column. This results in less injury to the abdomen and lower back as impact is dispersed.