The present invention is a device for the restraint of patients on a treatment table. More specifically, the invention is designed to provide lateral side pressure on a patient in the abdomen, thorax, and hip areas during a radiation treatment. The main components of the device are paddle(s) and at least one crossbar assembly. The paddles are coupled to a crossbar assembly, which is positioned on a treatment table under the body cushion in which the patient is positioned. The paddles can be moved laterally along the crossbar such that they put lateral pressure on the cushion and the patient.