BRITISH MADE FLEXIBLE SPRINGLESS MATTRESSES.THE MATTRESS CONSIST OF A POLYURETHANE FOAM INTERIOR WHICH IS VACUUM PACKED FOR EASY STORAGE AND DISTRIBUTION.THIS LATEST INNOVATION IN POLYURETHANE PRODUCTS PROVIDES SUPERB COMFORT AND DURABILITY. WHEN FULLY UNPACKED THE MATTRESS WILL FILL OUT TO ITS FULL AND PERMANENT SIZE PROVIDING A HEALTHY NIGHTS SLEEP FOR MANY YEARS TO COME.IT IS NORMAL FOR A VACUUM-PACKED MATTRESSTO TAKE A NUMBER OF HOURS TO FULLY EXPAND TO ITS NORMAL SIZE AFTER BEING UNWRAPPED AND UNROLLED.THE MATTRESS ARE TOTALY HYPO-ALLERGENIC AND ARE ALSO SUITABLE FOR KIDS BUNK BEDS, METAL /PINE BEDSTEADS.