A system for supporting and positioning a person. A flexible cover layer defines a support surface for the person, and a formable layer is coupled to the flexible cover layer. The formable layer includes a sealed bladder adapted to be in fluid communication with a vacuum source, and particles disposed within the sealed bladder. The system is operable in a first configuration in the absence of the vacuum, and a second configuration in the presence of the vacuum. In the first configuration, the particles are substantially movable relative to one another such that a contour may be provided to the support surface. In the second configuration, substantially immovable relative to provide rigidity to the formable layer to maintain the contour. A controller coupled to sensors may control the vacuum source to move said system between the first and second configurations. Methods of supporting and positioning the person are also disclosed.
