AirFoam 4-Position Pillow features:

• 4-Position universal pillow is
  designed for use as a back
  support, behind the neck,
  between the legs and under
  the knees
• Thermo-sensitive memory
  foam contours perfectly to
  your body for comfort when
  resting or sleeping
• Machine washable plush
  velour cover
• (L) 17.75”x (W) 4.5” x (H) 8.25”
  (L) 45.09cm x (W) 11.43cm x (H) 20.96cm