Orthospine is made up of high density PUF to provide Enhanced Lumbar (lower back) support and it is steam treated for superior hygiene. - High Back Support - Orthobond Care Dimension: - 78x72x5.5/4.5 Inch (King Size) - 78x60x5.5 inch (Queen Size) - 78x48x5.5 Inch (Medium Size) - 78x36x5.5 Inch (Single Size)