The core of this mattress is the exclusive S+ Pro 5 Zone Independent Spring System. Designed for advanced strength and spinal alignment, each Independent Spring is placed explicitly within each of the 5 Zones to ensure it responds and supports the natural contour of the spine and body. For added strength, durability and longevity each spring is individually wrapped in N-100 Medical Grade Fabric which is 42% stronger than any regular pocket spring.

To achieve its advanced strength, the S+ Pro Spring has a super high spring count spread out across the 5 Zones. This ensures maximum support for the body and spine by the placement of spring into multiple levels. Firm Support is provided for the head, lower back/hips and the feet. Slight pressure relief is then provided for the shoulders and knees for comfort.

Above the S+ Pro spring is the Sleep Firms exclusive Boomerang Foam which has been specifically designed and engineered for a firm mattress in a box. This premium density foam has an extremely high rebound level that does not lose its hardness, ensuring long-lasting firm support. The Boomerang Foam by Dunlop is Geca Certified and treated with Ultra Fresh, which is anti-microbial. It is also a Dunlop Approved foam with the National Asthma Council Sensitive Choice.

Sleep Firm is the solution for those in need of a mattress that combines exceptional support with the convenience of direct-to-your-door delivery. With a 9 out of 10 firmness rating, this mattress is designed for Australians who prefer a solid and supportive sleep surface. It perfectly balances support and comfort, ensuring you wake up without the discomfort that often comes from softer mattresses.

However, a word of wisdom: We've received a few returns from customers who found our mattress too firm. Yes, when we promise firmness, we truly deliver—our mattress is exceptionally firm, perhaps even more so than your determination to start a new diet "tomorrow." Imagine a cloud made not of mist but of something much sturdier—that's the kind of support we're talking about.

What sets our mattress apart is its innovative delivery method—compressed and boxed for your convenience. Say goodbye to the struggle of maneuvering a bulky mattress through your home. Our boxed design simplifies the setup process, making it ideal for back sleepers, stomach sleepers, or anyone looking for a firm foundation for a restful night's sleep. Give it a try and discover why our firmer, box-delivered mattress is becoming the preferred choice for satisfied sleepers across Australia.