A protective half sock for use in multi-stage recovery includes a sock body constructed of a rib knit with Terry cushion, and a knitted posterior welt configured with the sock body and defining a rear opening for insertion of a limb. A first silicon germanium region is disposed in the opening, wherein the first silicon germanium region has a first germanium percentage. Key values are generated for both existing records and new records subsequently requested to be inserted into the table, respectively. An entity tag value is derived from identifiers in accounting information of the second publication message to identify data in the data session slot associated with the mobile unit.