A system for supporting a patient on an inclined surface includes an inflatable device. The inflatable device includes a top sheet of material connected to a bottom sheet of material, the top sheet and the bottom sheet defining a cavity to be inflated, wherein the bottom sheet of material is configured to permit air to pass from the cavity to the exterior of the device and to flow between a bottom surface of the device and a support surface upon which the device is configured to rest, and an input configured for receiving air to inflate the device. The system further includes a high-friction pad configured to attach to the top sheet of material, and at least one attachment system configured to maintain the device on a support surface.