Bonnell Spring Mattress

A Bonnell spring mattress uses the oldest continuous-coil spring design still in production: hourglass-shaped steel coils joined by a helical wire so the springs work as one connected unit, rather than the individually sleeved coils of a pocket spring bed. Betalife's Bonnell spring mattress is a 15cm profile built from metal Bonnell springs, foam and a knitted polyester quilt, with a tight top, rated Medium at 5 out of 10 where 10 is softest. It is made in Single 91 x 188cm, Double 137 x 188cm and Queen 153 x 203cm. The connected coil layer means the mattress moves as a single sheet, which is what separates it from a pocket spring build.