The Blue Magic Sontaire Waterbed Mattress Bladder fits conveniently inside your softside foam cavity to fit the interior dimensions of each size foam tray listed in the drawings. Enjoy the plush comfort of this fiber filled mattress. Offers maximum support with thermal bonded fiber. The 4 point memory stretch tether system reduces wave movement and prevents the fiber from shifting. Assembled in the USA. Water conditioner is required to be added each year to validate the warranty. Top fill for convenience in filling, draining or removing excess air. Superior Lap seam technology. Fits most cylinder bed constructions for a 4 inch depth. Eco-Friendly vinyl exceeds US and European standards. Durable 18 mil vinyl thickness. Measurement of inside dimensions of foam tray is recommended to ensure proper bladder size and fit.The Boyd Customer Service number is 314-447-0733.