Bonnell springs are one of the oldest mattress spring designs still in use. They appear in many budget mattress options and are sometimes marketed simply as innerspring or coil mattresses. Understanding what Bonnell springs actually are and how they compare to more modern pocketed spring systems helps you make a well-informed decision.
What Bonnell Springs Are
Bonnell springs, sometimes called open coil springs, are an hourglass-shaped wire coil system where the individual springs are connected to each other by wire at the top and bottom. The interconnected nature of the spring system means that when one spring moves, neighbouring springs move with it.
This design has been used in mattresses for well over a century and is inexpensive to manufacture. Bonnell springs are typically found at the lower end of the spring mattress price range.
The Main Limitation: Motion Transfer
The interconnected design of Bonnell springs has one significant practical consequence: motion transfers readily across the entire spring system. When one person moves during the night on a Bonnell spring mattress, that movement propagates through the interconnected coils to the sleeping surface on the other side.
For couples sharing a mattress, this can be a disruptive issue. A partner getting up during the night, rolling over, or shifting position creates noticeable disturbance across the whole surface.
For a solo sleeper, this is less of a concern.
Support and Durability
Bonnell springs provide a generalised, somewhat uniform support rather than the localised, independent support of a pocketed spring system. They respond to the heaviest weight placed on them, which can mean different parts of the body receive the same spring response rather than a calibrated response to each area's specific weight.
Over time, Bonnell springs can develop squeaking as the interconnecting wire wears. The coils can also lose tension unevenly, leading to softer areas developing in the mattress before the whole spring system is exhausted.
When a Bonnell Spring Mattress Is a Reasonable Choice
For a solo sleeper where motion transfer is not a concern, in a guest room that sees limited use, or as a budget option for a short-term sleeping arrangement, a Bonnell spring mattress can be adequate.
For a primary sleeping surface used nightly, particularly by a couple, the limitations of Bonnell springs in terms of motion isolation and long-term support make pocketed spring or other constructions a more appropriate choice.
Pocketed Spring as the Better Alternative
A pocketed spring mattress uses individually encased coils that operate independently. This provides the motion isolation that Bonnell springs cannot achieve and more localised, calibrated support. The natural airflow through the spring core is also better in a quality pocketed spring construction.
The price difference between a basic Bonnell spring mattress and a quality pocketed spring option is real, but for a mattress used every night, the performance difference over the lifespan of the mattress justifies the additional investment for most buyers.
The Somnuz mattress collection includes pocketed spring options suited to Singapore's conditions. For guidance on what suits your needs, visit our showroom in Singapore. The Sleep Well resource page provides broader sleep guidance.
Frequently Asked Questions
Is a Bonnell spring mattress good for couples?
Not ideally. The interconnected spring system transfers motion readily across the mattress, meaning partner movement is felt by both sleepers. A pocketed spring mattress provides significantly better motion isolation for couples.
Is a Bonnell spring mattress good for solo sleepers?
It can be adequate for a solo sleeper, particularly in a guest room or for short-term use. The motion transfer limitation is not relevant when there is only one person on the mattress.
How long does a Bonnell spring mattress last?
Typically five to seven years for regular use, shorter than quality pocketed spring alternatives. The interconnected coils can lose tension unevenly and develop squeaking with wear.
What is the difference between Bonnell and pocketed springs?
Bonnell springs are interconnected and move together as a system. Pocketed springs are individually encased and operate independently. Pocketed springs provide better motion isolation, more localised support, and typically better longevity.
Is a Bonnell spring mattress suitable for Singapore's climate?
Like all spring constructions, it allows some airflow through the coil system. However, the overall construction quality of a budget Bonnell mattress may limit breathability in the comfort layers above the springs.
Should I buy a Bonnell spring or pocketed spring mattress?
For a primary sleeping surface, a pocketed spring mattress provides meaningfully better motion isolation, localised support, and typically better durability. For occasional guest use where cost is the primary constraint, a Bonnell spring option may be adequate.
Find the Right Spring Mattress for Your Sleep
A pocketed spring mattress provides considerably better performance for most Singapore sleepers than a basic Bonnell alternative.
Browse the Somnuz pocketed spring collection to explore options. Or visit our showroom in Singapore for guidance on what suits your needs.