Why pocket-spring beats Bonnell, continuous coil and all-foam

Not all spring mattresses are equal. A Bonnell spring system - the traditional hourglass coil connected to neighbouring coils in a single grid - transfers motion across the entire mattress surface and compresses unevenly under different body weights. A continuous coil system works similarly: every spring is linked, so pressure at one point affects the whole grid. If you've ever been woken by your partner turning over on a budget spring mattress, you've experienced the Bonnell or continuous-coil effect.

Pocket springs are completely different. Each spring sits in its own individual fabric pocket, completely independent of its neighbours. When pressure is applied to one spring, only that spring compresses - the rest of the surface remains at full height. This independent action provides contoured support across every body shape and sleeping position, isolates motion between partners and, critically, prevents the sagging body impression that forms in interconnected spring and all-foam systems over time.

Why pocket-spring firm outperforms all-foam for longevity and temperature

All-foam mattresses - including gel memory foam and high-density poly foam - retain body heat because foam is an insulating material with limited airflow. Pocket-spring mattresses breathe: the springs themselves are open, and air moves freely through the mattress body with each movement. In Sydney's warm climate, this is not a minor comfort detail - it is the difference between waking overheated and sleeping through the night.

Foam also degrades. Under repeated compression cycles, the cellular structure of foam breaks down and the mattress softens permanently. A high-density pocket-spring core, like that in the Sleep Firm range, maintains its geometry and firmness because the tempered steel springs return to their original shape after compression cycle after cycle, year after year. The Sleep Firm range is backed by a 15-year warranty and has been independently rated Firm 8/10 - a level that would be impossible to guarantee in a foam-only mattress.

The Sleep Firm pocket-spring range - three models, one core

All three Sleep Firm models share the same high-density pocket-spring core. The difference is the comfort layer above it. The Standard (RRP from $1,099) pairs the core with a quilted cotton comfort layer for the purest firm feel. The Luxe (RRP from $1,899, adds a gel-infused memory foam comfort layer and quilted pillow top. The Ultra (RRP from $1,499) is the tallest-profile model with extra-deep premium comfort layers. All are Australian-made in Melbourne by Chiropedic 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 express next-business-day delivery on Queen, King and Double across Sydney and Wollongong (order before 2pm). Explore more: Sleep Firm collection · Sleep Firm mattress Sydney · Firm mattress for back pain Sydney.