A mattress assembly includes an inner core assembly 48 including a core portion 49 having a head end and a foot end defining a core longitudinal lengtha left width adjustment portion 56 comprising a plurality of left width adjustment bladders 60, the left width adjustment portion extending laterally away from a left side of the core portiona right width adjustment portion 58 comprising a plurality of right width adjustment bladders 62, the right width adjustment portion extending laterally away from the right side of the core portionthe left and right width adjustment portions each having a head end substantially longitudinally aligned with the head end of the core portion and extending footwardly a longitudinal distance less than the core longitudinal length thereby defining left and right relief portions 66, 68.
