Strobel Organic Waterbed Mattress Hydro-Support 1800 King, Nothing is more natural than water Strobel waterbeds are naturally fire resistant and do not require flame retardant chemical based flame barriers like other mattresses to comply with federal fire safety regulations Strobel water-mattresses go a step further with our unique deep molded "Feathertop" pressure reduction surface. Our "Feathertop" surface relives surface tension and further reduces pressures to allow for true flotation sleep 25 mil vinyl (25% thicker than most) Made in USA by Strobel