Century water mattress feature full 20 mil American Made vinyl (10% thicker than many who claim 20 mil but actually use 18 mil), Strobel One-Piece Watermattress Construction, 4 layer densified fiber waveless system. Fiber is thermally bonded for longest life, not resin bonded. (Cheaper adhesive resin bonding can break down over time in water.) Reinforced corners. Fits standard wood type waterbed frames 48 by 84-inch ID. If you dont already have a frame, frame building instructions included. Made in USA. 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. Our bodies are over 90% water. Strobel waterbeds achieve nearly Zero-Gravity. Archimedes Principle, proved a body floating or submerged in a liquid is buoyed up by a force equal to the weight of the liquid displaced. Thus the human body loses the amount of weight of the liquid displaced so that your body is lightened. This imposes less pressure on the body. Many people rave about the health benefits and how well they sleep on Strobel Waterbeds. Made in USA.