Expensive mattresses often have up to 3000 springs. Utilizing reflex foam instead of steel, Pureflex mattresses have millions of "springs". The high-density reflex foam used in this mattress is an astonishingly comfortable and innovative sleeping surface. Composed of polymers calibrated to perfectly mold to your body's pressure points without yielding where you need the most support, Pureflex assures you'll wake up from a fantastic night's sleep to a fantastic day. The reflex core of this mattress is topped with visco-elastic memory foam. Using the heat of your own body to shape itself, memory foam is soft, springy, and feels like a warm hug when you set down to sleep. The hybrid nature of this mattress means orthopedic support doesn't come at the cost of comfort! Enclosed in a premium soft-knit zip cover - washable, so keeping clean is easy! Manufactured in the UK to the standards of the National Bed Federation, using CertiPUR-certified foam, you can (quite literally) rest assured on your Pureflex mattress; knowing it is free of heavy metals and harmful dyes. Naturally resistant to mildew and dust mites, our foam is hypoallergenic and a great choice for asthma sufferers. When we package our mattresses, we compress them with more than 10,000 pounds of force per square inch. That's more force than an elephant standing on your foot! We do this to keep the package small and the shipping cheap - and we pass that saving on to you.