Foam vs Spring Mattress for Sofa Beds: Which One is Better?

Choosing the right mattress for a sofa bed isn’t as straightforward as it might initially seem - especially when the sofa in question is a centrepiece of your living space, not just an occasional guest solution. At Furl, we specialise in crafting smart space-saving lounge options that are every bit as comfortable and supportive as traditional furniture, and the mattress plays an essential role in that promise.

Let’s explore two of the most popular types - foam and spring - and the nuanced considerations that could help guide your decision.

The Mattress Matters More Than You Think

A sofa bed isn’t just a sofa, and it’s certainly not just a bed either. It lives in that in-between space: a multifunctional workhorse that must hold its shape, perform daily, and remain inviting to both sit and sleep on.

When it comes to mattresses, people often default to what they know from their bedroom setup. But that logic can be misleading. Sofa beds must fold, tuck, and reconfigure - the mattress has to endure more dynamic use and greater physical stress than a static bed. That’s why we don’t treat mattresses as an afterthought. Quite the opposite: we’ve spent years refining them.

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Foam Mattresses: Precision and Pressure Relief

Foam mattresses - especially high-density or memory foam varieties - offer a kind of moulded comfort that adapts to the contours of the body. They’re excellent at pressure relief, which is especially useful if the sofa bed will be slept on frequently or for longer stays (think guests who don’t leave after a single night - we’ve all had them).

The appeal of foam lies in its simplicity; there are no moving parts, no springs to wear down or creak over time, and with high-quality foam, there’s a uniformity of feel across the entire surface. That means fewer “dead zones” and a more consistent sleep experience, whether you’re sprawled out or curled up.

Of course, not all foam is equal - cheaper variants tend to lack resilience and may soften too quickly, leading to sagging or diminished support over time. That’s one reason we recommend only certain foam options, and never compromise on density or durability. And if you’re looking at our must-try sofa bed mattresses, you’ll notice we’ve curated only the foam types we believe can genuinely withstand everyday use - because we’ve tested them, and because we build the beds ourselves.

Spring Mattresses: Familiarity Meets Structure

On the other hand, spring mattresses offer a traditional bounce and resistance that many find deeply reassuring - there’s something about the familiarity of it that appeals, especially to those who find foam a little too slow to respond or too “sinking”.

The advantage of a spring mattress in a sofa bed comes down to structure. The springs (typically pocket-sprung in higher-quality models) create clear zones of support across the mattress, giving it a sense of internal architecture. If you’re someone who needs firm support - or sleeps hot and wants more airflow - spring may be your go-to. Springs naturally allow better ventilation, which is a factor many overlook until it’s midsummer and the spare room turns tropical.

That said, the challenge lies in durability. Not all spring systems are created equal; lower-quality open coil constructions can wear unevenly or produce pressure points, particularly when folded repeatedly. That’s why, at Furl, we only use sprung mattresses designed specifically for sofa beds - tested over thousands of open/close cycles and built to last.

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So… Which One Is Better?

We’ll admit it: there’s no definitive answer. That might seem like a cop-out, but in truth, it’s about priorities - comfort, usage frequency, temperature sensitivity, support level, budget, personal preference… it all factors in.

If your sofa bed is in a living room and gets daily use as a seating area, but only occasional sleep duty, you might prioritise the feel of the cushions over the mattress beneath. In that case, either option could work - you’re free to choose based on comfort and support rather than wear. But if it’s a guest bed that sees serious overnight traffic, or even a full-time bed in a compact studio space (yes, it’s more common than people think), then the quality of the mattress - and the way it interacts with the bed mechanism - becomes essential.

And this is where a company like Furl makes a real difference. Our smart space-saving lounge options are engineered holistically - the mattress isn’t an add-on, it’s part of the design language. We don’t retrofit a generic bed mattress into a fold-out mechanism. Instead, we craft every detail to serve both purposes equally.

Some Final Thoughts

We think it’s also worth considering the room’s function. Is this an occasional-use room for guests? A study that converts into a bedroom once a fortnight? A studio flat where the bed and sofa must co-exist in harmony?

Foam might win on minimalist aesthetic and contouring comfort; springs might edge it on structure and airflow. But what truly matters is how well the sofa bed serves your life - not just the mattress inside it.

There’s also a psychological factor: how a bed feels to the touch, how it makes you feel when you lie down at the end of a long day (or a long journey). That’s not something we can quantify - but we’ve certainly seen it in action, time and again, in our showrooms.

If you're still unsure, we always recommend trying our sofa bed mattresses in person - or at the very least, speaking to one of our specialists. Because while we do offer both foam and spring mattresses, not every version of either is created with equal intention. And that, in the end, is the Furl difference.

Thinking of swapping the mattress in a sofa bed you already have? Read can you replace a sofa bed mattress? first.

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David Norman, founder of Furl
David Norman

David Norman is the founder of Furl, a UK-based furniture brand known for redefining how people live with space-saving, design-led storage beds and sofa beds.

With almost two decades of hands-on experience in product design, manufacturing, and brand strategy, David has built Furl into a trusted name among urban professionals seeking calm, clutter-free homes. His work has been recognised for its innovation and craftsmanship, with features in publications such as MSN and The Telegraph.

David continues to lead Furl’s creative direction, developing furniture that solves real-world problems without compromise.