Boyd's King Ultra Waveless w/Lumbar Support Hardside Waterbed Mattress Kit includes Stand up Liner, Fill & Drain Kit Ultra Waveless w/Lumbar Support, Stand up Liner, Fill & Drain Kit Patented air custion 4 layer reinforced corners Patented memory hi-loft thermal bonded fiber Comprehensive 17 Year Limited warranty 3 Layer ergonomically Deisgn Lumbar Support, 4 additional layer wave reduction system