DMI Alternating Pressure Replacement Mattess Pad for Twin Size Beds, Tan Price:  $27.02 (as of 18/10/2017 06:05 PST- Details)

This pressure pad helps improve circulation and alleviate bed sores by automatically altering the pressure against the person’s body without the need to constantly turn them. Pad only – must be used with a pump (sold separately)
21 body support tubes continually change pressure.
Quiet safe, effective, portable and virtually maintenance free