Understanding the mattress firmness scale

The mattress industry typically uses a 1-to-10 scale to describe firmness: 1 is ultra-plush (like sleeping on a cloud of cotton wool), 5 is medium, and 10 is the firmest construction theoretically possible. In practice, most mattresses sold in Australia sit between a 3 and a 7. A Firm 8/10 is genuinely firm - the kind of firmness that supports stomach sleepers, back-pain sufferers and heavier body types - and very few mattresses on the Australian market can honestly claim it.

Here's where the confusion starts: the labels "firm", "extra firm" and "ultra firm" have no standardised industry definition in Australia. One brand's "firm" may be a 5/10 on an objective scale. Another brand's "extra firm" may be a 6/10 - barely beyond medium. These labels are marketing terms, not measurements. Without a published firmness number from an independent source, "extra firm" on a mattress tag tells you almost nothing.

Firm vs extra firm - the real difference and why "extra firm" is often a myth

Genuine extra-firm mattresses (9/10 to 10/10) exist in medical and institutional contexts - orthopaedic hospital beds, for example - but they are rarely comfortable for everyday sleep for most people. A true extra-firm mattress creates pressure points at the shoulders, hips and ankles because the surface does not yield at all, concentrating body weight on those bony prominences. Most people who believe they need "extra firm" are actually seeking a consistent, long-lasting firm feel that does not soften over time - and a quality Firm 8/10 delivers exactly that.

The Sleep Firm range compares as follows across a plain-language firmness guide: Sleep Firm Standard (8/10) - maximally firm surface feel, ideal for stomach sleepers, back sleepers, back-pain sufferers and heavier singles; a low comfort layer that delivers the firmness without pressure points. Sleep Firm Luxe (8/10) - the same firm 8/10 support foundation, but with a gel-infused memory foam comfort layer and pillow top that cushions shoulders and hips for side sleepers and couples; still unambiguously firm. Sleep Firm Ultra (8/10) - the tallest profile with the deepest comfort layers, still firm 8/10 at the core, designed for heavier sleepers and couples who need a larger support platform without sacrificing firmness. None of these is an "extra firm" in the marketing sense - and that is precisely the point: they are honest, measurable, independently verified Firm 8/10 mattresses.

Which Sleep Firm model is right for you - and where to try them

If you have been searching for a genuinely firm mattress and feel burned by mattresses that softened quickly, the Sleep Firm Standard is the place to start. It is Australia's best-selling firm mattress for a reason - RRP from $1,099, backed by a 150 Night Sleep Trial (refund or exchange) and supported by a 15-year warranty. If you'd like a firmer foundation with a more cushioned surface, the Luxe (RRP from $1,899, 100 Night Comfort Guarantee Exchange) or Ultra (RRP from $1,499, 100 Night Comfort Guarantee Exchange) offer the same core support with more comfort-layer choice. All are Australian-made by Chiropedic in Melbourne, and GECA, Sensitive Choice and ASRF certified.

Try all three side-by-side at Prospect (27 Rowood Rd), Campbelltown (20 Blaxland Rd) or Warrawong (91-95 King St). Free next-day delivery on Queen, King and Double across Sydney and Wollongong (order before 2pm). Related guides: Firm mattress for back pain Sydney · Firm mattress for stomach sleepers · Sleep Firm collection.