IMPACTO lumbar support with inflatable multi-celled air chambers. Palm-grip self-contained aspirator with pressure release valve. Fire retardant Proban outer shell with foam liner. Adjustable hook and loop closure. "This item ships directly from the manufacturer and only ships on Wednesdays, regardless of what shipping option is chosen. There are no exceptions. Please keep this in consideration if choosing expedited shipping. For example, if you place an order for Next Day Air service on a Thursday, the order will not ship until the following Wednesday."