A support pad includes a recess in an upper surface for receiving an inflatable transfer mattress. The recess may extend to a depth such that an upper surface of the transfer mattress is flush with the upper surface of the support pad when the transfer mattress is deflated. Alternatively, the recess may be adapted for receipt of a transfer mattress having an accessory on an upper surface of the mattress such that an upper surface of the accessory is flush with the upper surface of the pad. The support pad may include side and end portions to form an overlay adapted for placement on an underlying support member having larger dimensions than the transfer mattress. The support pad may also be sectioned to include one or more detachably connected portions to facilitate sliding removal of a transfer mattress from the recess of the support pad.