Discover SleepMaker Q4 with Quad Strand Engineering

Where to buy

What is Q4?

Q4 Coils use Quad Strand Engineering to provide a remarkably stable and supportive sleep experience. The coils are engineered from four strands of heat-tempered wire wound together, creating a coil that's not only incredibly strong but also highly responsive to individual body movements. This means that coils seamlessly adapt as sleepers shift positions during the night, providing consistent support.
The coils are also gently ‘spring loaded’ for superior responsive support, effectively absorbing energy and minimising motion transfer across the mattress. This is especially beneficial for couples or those sharing the bed with restless sleepers.

Q4 is a game changer

The evolution from our previous Triple Helix spring to our new Q4 Coil is a fundamental leap in comfort engineering. We've moved from three strands to four, not to make the coil thicker, but to make the entire structure smarter. This more balanced geometry allows the four strands to share bodyweight more effectively than three, meaning each wire carries less stress. The result is a more stable coil with less twist and movement

Four Benefits of Q4

Strength and Performance

Quad Strand Engineering spreads the load across four wires, for an incredibly strong and responsive coil that wears less over time.

Stable Support

Q4 Coils adapt seamlessly to individual movements, providing consistent comfort with less twist and movement.

Motion Isolation

Designed to absorb more energy across the system to reduce motion transfer and sleep disturbance.

Quality & Durability

Engineered in Australia to have 25% less stress on each wire and withstand years of repeated compression, for long-lasting support.

Strand Science Deep Dive

Mattress springs experience bending fatigue	A mattress spring is almost never overloaded. Instead, failure happens gradually, over time. Every night the spring is compressed and released repeatedly over several hours. Each compression causes the wire to bend, stressing the outer surface of the wire. This goes on for years, with the spring losing a tiny amount of performance each cycle.
Fatigue causes incremental deterioration	Fatigue happens at the microscopic level. Micro-cracks form on the surface of the wire where bending stress is highest. These cracks grow a tiny amount each cycle, gradually making springs weaker and less resilient. This is why older mattresses may feel soft long before anything breaks, and why they offer less support near the end of their life.
Thinner strands resist fatigue better	Thinner wire strands bend more gently, experiencing less strain per wire. This means that micro-cracks take longer to appear, and there will be fewer of them. A cable coil design made of thinner wires will resist fatigue better than a spring made of a single thicker wire. This is why aircraft cables, elevators and high-end suspension systems use many thin wires twisted together, not a few thicker ones.
Cable coils distribute damage	When you have a spring that is made of multiple wire strands twisted together, fatigue is shared across all of the wires. This means damage to each individual strand is proportionately less. If one wire degrades, the other wires in the coil can carry the load, and the spring functions better for longer.
Cable coil springs age better overall	Even when the initial size, strength and firmness are the same, springs experience fatigue very differently. A single-wire spring is more prone to bending strain and will degrade sooner. If the springs give way completely, you'll notice! A cable coil spring experiences less bending strain, stress cracks take longer to form, and you're not likely to notice if a single wire gives way. Cable coils don't perform better by being bigger, stronger or firmer; they share the load and age more gracefully.
4 strands > 3 strands	With 3 strands in a coil, each strand carries 33% of the load. In a 4 strand coil, each strand carries 25% of the load. This reduced stress for each individual wire means less fatigue, slower spring deterioration, and better mattress performance over time.

Our Q4 Coil builds on the principles of coil engineering to produce a more durable spring that will resist fatigue and provide reliable support for longer. That doesn't mean our other springs are inferior, or that they're going to fail catastrophically! It just means that sleeping on a Q4 spring will feel just as good in 10 years as it does today.

Where to buy

Q4 Technology is exclusively available in the SleepMaker Luxury Platinum Collection at Harvey Norman New Zealand.

Where to buy Special Offers

Frequently Asked Questions

That's not what this technology changes. The four-strand design adjusts the structure of the coil, not its firmness. The feel of the mattress will depend on the overall build, including comfort layers and tension settings. What the Q4 coil is designed to do is maintain its support profile more consistently over time.

Here's the non-gimmick version: with three strands, each carries about 33% of the load. With four, each carries 25%. That's a meaningful reduction in stress per wire. Less stress means less fatigue. Less fatigue means slower deterioration. This is the same principle used in aircraft cables and elevator systems, because distributing load across more thin strands objectively extends lifespan.

The Q4 Coil is designed and engineered by the SleepMaker product experts in New Zealand and Australia. The Q4 MicroCoil features exclusively in Luxury Platinum Couture mattresses, which are are hand-made to order in New Zealand and only available at Harvey Norman.

This is exactly what the Q4 Coil was engineered to solve. The Q4 uses four thinner strands sharing the load: each wire bends more gently per cycle, and fatigue is distributed across all four. The goal isn't to feel dramatically different on night one. It's to feel the same on night 3,000.