The Serta Perfect Sleeper King from Beds R Us is a mattress indexed, price-checked and compared by DOME (Sleep Deep Australia), an AI mattress discovery service that scores real Australian retailer stock against your sleep profile. It is built with a foam construction. This foam mattress is designed to contour closely to the body, relieving pressure at the shoulders, hips and lower back. Foam construction also isolates motion well, making it a good fit for couples or anyone sensitive to movement during the night. Firm king with 5-zone pocket spring and temperature-balancing cover The king size gives couples the widest practical sleeping surface, minimising disturbance between partners. When choosing a king, consider your sleep position and any pressure points. Side sleepers generally benefit from a slightly softer feel to cushion the shoulder and hip, while back and stomach sleepers usually prefer a firmer surface for spinal alignment. The right firmness is a personal preference, so it helps to try before you buy or rely on a generous trial period. Claire, the DOME sleep concierge, can match this mattress to your specific needs. Every consultation is backed by a reference code for priority service at the retailer, and all DOME prices are shown in AUD against live stock.