Why heavier sleepers need a genuinely firm mattress

Body weight is the primary force acting on a mattress. A sleeper weighing 60kg exerts far less compression on a mattress core than a sleeper weighing 120kg - and the materials that hold up well for lighter sleepers may fail much sooner under greater load. This is particularly true of foam-based mattresses: the cellular foam structure compresses permanently under sustained heavy weight, creating a body impression that progressively worsens. Many 100kg+ sleepers who visit Best in Beds describe the same pattern - their mattress felt fine for the first few months, then the centre started dipping, and within a year they were effectively sleeping in a hammock.

A high-density pocket-spring core addresses this problem at a structural level. Each spring is a tempered steel coil that compresses and fully returns to shape after every sleep cycle, regardless of the load applied. The Sleep Firm range uses springs engineered to support heavier body weights without permanent deformation - the same firmness you feel on day one is there on day one thousand. The entire range is backed by a 15-year warranty, which is a guarantee Best in Beds can make precisely because the construction holds up under real-world load over real-world time.

Which Sleep Firm model suits heavier sleepers best?

All three models share the same high-density pocket-spring core rated Firm 8/10 and are Australian-made in Melbourne by Chiropedic. The Sleep Firm Standard (RRP from $1,099) is suitable for singles up to approximately 100kg who want maximum firmness and minimal profile. For heavier sleepers - or couples where the combined weight is 160–200kg - the Sleep Firm Luxe (RRP from $1,899) provides the firm pocket-spring foundation with a gel-infused memory foam comfort layer that distributes pressure across a wider surface area, reducing peak load on any single set of springs.

For the heaviest sleepers and couples with a combined weight of up to approximately 240kg, the Sleep Firm Ultra (RRP from $1,499,) is the flagship recommendation. The Ultra is the tallest-profile model in the Sleep Firm range with the deepest premium comfort layers - engineered to provide the greatest support depth and the widest weight distribution of the three. All three are GECA-certified, Sensitive Choice approved and ASRF endorsed, and carry a 15-year warranty. The Ultra and Luxe carry the 100 Night Comfort Guarantee (exchange); the Standard carries the 150 Night Sleep Trial (refund or exchange).

Visit any Best in Beds showroom - and bring your partner

The best way to assess whether a mattress will hold up under your weight is to lie on it in the showroom and feel whether the support feels solid and level. Best in Beds encourages heavier customers - and both partners of heavier couples - to test the Sleep Firm Ultra, Luxe and Standard back-to-back at any of our three showrooms: Prospect (27 Rowood Rd), Campbelltown (20 Blaxland Rd) or Warrawong (91-95 King St). Our sleep specialists are experienced at matching body weight to the right model and size.

Free express next-business-day delivery on Sleep Firm Queen, King and Double across Sydney and Wollongong (order before 2pm). Free 7–14 day delivery Australia-wide on all sizes. Explore: Sleep Firm collection · Firm pocket-spring mattress Sydney · Firm mattress for back pain Sydney.