● Five turns in each bonnell coils provide excellent self-support capability.● Knit with OEKO-TEX certified ,soft and breathable style suits every seasons.● 2.0cm convoluted foam in quilting plays a role of sound insulation,sound absorption and shock absorption.● Premium foam in layer part makes it more comfortable,Conforms to body curves (shoulders, hips, knees) to spread weight evenly, easing pressure points and soreness.