INNOMAX Genesis 800 Ultra Waveless Lumbar Support Waterbed Mattress, King Genesis 800 Ultra Wave less Deep Fill King Waterbed Mattress for full depth rigid side box frame near Wave less Performance and 20 year warranty Weightless feel featuring near Wave less Performance and Gravity Neutral Fluid Suspension premium enhanced Mid-Body Support system;Puncture Resistant Multi-Layer wave elimination system and 24 mil premium paralyzed vinyl Sculpted Body Profile sleep surface and generously overcut Low Tension design 4 Way tethered support system for Integrated Internal Component Stabilization Phase II air release valve and recessed black bottom L Seam construction Use with approved Waterbed Heater Waterbed Safety Liner Waterbed Water and Vinyl Conditioner Do Not Fill above Safety Liner