● Five turns in each bonnell coils provide excellent self-support capability.● 3cm convoluted foam in quilting plays a role of sound insulation,sould absorption and shock absorption.● With 2cm premium foam in comfort layer still supply comfort.● Decorative edge tape sewed on border looks like an euro top, and adds its value.● OKEO-TEX Certified polyester fabric with a color or pattern that hides dirt,durable features suits every season.