The Halo Safety Ring is the only patented institutional bed mobility device that eliminattes the four most critical zones of entrapment: 1 - within the rail, 2 - between the top of the compressed mattress and the bottom of the rail between rail ports, 3 - between the rail and mattress, & 4 - between the top of the compressed mattress and the bottom of the rail at the end of the rail. The Halo Safety Ring meets and exceeds the HBSW and FDA's final dimensional guidelines against bed entrapment. The Halo Safety Ring passes the new "Bed System Measurement Device" pass/fail test that has been approved for Bed System testing by the FDA and state surveying teams. Mounts to bed frame for stability.