The Sit-Back Cushion features:

• The ObusFormeTM Sit-Back cushion is
  designed to provide ergonomic support
  and comfort for either your lower back
  or seat area
• The thermo-sensitive memory foam
  cushion molds to your body for a
  custom fit
• Lightweight and compact for use at
  home, in the office or car, or on the go
• (L) 15.75”x (W) 3.8” x (H) 15.5”
  (L) 40.01cm x (W) 9.65cm x (H) 39.37cm