Sérénade Mattress Construction • 510 GA 14 springs joined with the Armalite process Padding • square 0.5'' grid on each side of the mattress on its entire lenght • synthetic fiber felt and high density/shell foam Covering Border • polyester fabric • multiple needle stitching on 0.5" foam • stitched layer on foam with vents Wrapping • plastic bag Box Construction • wood foundation (9 horizontal and 5 vertical cross bars) • 81 conical GA 10 springs on a steel grid Covering • polyester fabric • stitched layer on foam Wrapping • plastic bag