Abstract: A novel restraining device for immobilizing a preselected portion of a prostrate human body when disposed on a body support platform or board having attachment locations has first and second panel sections which are detachably interconnectable in overlapping and variably adjustable relationship. Each panel section has extending therefrom adjustable attachment means, such as a pair of adjustable straps, which secure the panel section to the attachment locations. There may also be safety retaining means to ensure that the first and second panel sections are maintained in an interconnected relationship.