The short answer: if your back is fine at home and sore after two nights in the caravan, the problem is almost never the caravanning. It is the foam. Most caravans leave the factory with a 28 to 30 kg/m3 foam slab between 75 and 100mm thick. That density is fine for a couch cushion. Under a sleeping adult, night after night, it bottoms out, and once foam bottoms out your hips sink below your shoulders and your lower back spends eight hours in a curve it was never meant to hold.
What actually causes the sore back
A mattress does one job: it holds your spine in roughly the same line it holds when you are standing. Everything else is comfort marketing. When foam is too soft or too thin for your body weight, it compresses fully under the heaviest part of you, which for most people is the hips and pelvis. Your shoulders, being lighter, stay higher. The result is a sag in the middle, and your lumbar spine is bent sideways or downward for the whole night.
You do not feel this happening. You feel it at 6am when you try to stand up.
The reason it shows up in a caravan and not at home is simply that home mattresses are usually 25 to 30cm of properly specified foam or springs, and caravan mattresses are usually a thin slab chosen by the caravan builder to save weight and cost. The caravan is not the problem. The specification is.
Density is the number that matters, not thickness
This is the single most misunderstood thing in foam. Density is not firmness. Density is how much actual polyurethane is in a cubic metre of the foam, measured in kg/m3. Firmness is how hard it feels when you press it. You can have soft high-density foam and hard low-density foam.
Density is what predicts durability and support retention. Low-density foam feels acceptable in the showroom and then loses its structure quickly under repeated loading. High-density foam keeps doing the same job in year five that it did in month one.
| Foam density | What it is really for | In a caravan bed |
|---|---|---|
| Around 20 to 25 kg/m3 | Packaging, occasional-use cushioning | Bottoms out fast under an adult |
| Around 28 to 30 kg/m3 | Typical OEM caravan and camping foam | The usual cause of the sore-back complaint |
| Around 30 to 40 kg/m3 | The benchmark most caravan buying guides recommend | Acceptable for genuine bed use |
| 50 kg/m3 | Proper bed-grade support foam | What we put in every caravan mattress we cut |
Pressure relief versus support: you need both
People with back pain are often told to buy something firm. That is only half right. A rock-hard slab holds your spine straight but concentrates all your body weight onto your shoulder and hip, which is why you wake up rolling over every forty minutes and blaming the mattress for being uncomfortable rather than unsupportive.
What actually works is a two-part structure: a comfort layer that lets the shoulder and hip settle in so the pressure spreads out, sitting on top of a high-density core that refuses to let the pelvis drop. That is exactly how our Revive Foam Caravan Mattress is built, and it is the one we recommend first to anyone who tells us they have a sore back. An open-cell memory foam layer takes the pressure off the joints; the high-density core underneath keeps the spine in line.
If you prefer a firmer, more traditional feel without a memory foam layer, the Active Foam Caravan Mattress uses the same 50 kg/m3 core in a medium-firm build.
Four things to check before you blame your back
- Press the middle of your current mattress with a flat hand. If your hand reaches the bed base with moderate pressure, the foam has bottomed out. It is done, and no amount of topper will fix a collapsed core.
- Look at it side-on with the bedding off. A visible dip or hollow where you sleep is a mattress that has already failed.
- Check the age. Low-density OEM caravan foam frequently loses its usable support within a couple of seasons of regular use, and much faster if the caravan is used every second weekend.
- Check the fit. A mattress that is slightly too small shifts at night and leaves an unsupported edge, and you end up sleeping half-on it. This matters more in caravans than at home because so many caravan beds are island or cut-corner shapes.
Fit is part of the back-pain answer
A correctly specified mattress that does not fit the bed base properly still fails you. Caravan beds are rarely plain rectangles. Island beds taper or round off at the foot, French beds have a corner cut away, and some layouts have a wheel-arch notch. If the mattress is a rectangle jammed into a shaped hole, it lifts, curls at the edges, and stops supporting evenly.
We cut a Double at 1370 x 1880mm and an Island Bed (Queen) at 1520 x 1880mm, with rounded foot corners free of charge on every island bed order, and anything unusual cut from a template you trace yourself. There is a full walkthrough in our caravan mattress size guide.
Frequently asked questions
Can a caravan mattress really cause back pain?
It can certainly cause it to flare up. A mattress does not create spinal pathology, but sleeping for eight hours on foam that has bottomed out puts your lumbar spine in a sustained bad position, and that reliably produces morning stiffness and pain. If your back is fine at home and sore in the caravan, the variable that changed is the sleeping surface. Persistent or severe back pain is worth discussing with a doctor or physiotherapist, since a mattress is only one factor.
Is a firmer caravan mattress better for back pain?
Firmer is better than collapsed, but firmest is not best. You want a high-density supportive core that stops your hips sinking, combined with enough surface give that your shoulder and hip are not taking all the load. A slab that is simply very hard tends to cause pressure pain and constant turning.
Will a mattress topper fix my caravan bed?
Only if the mattress underneath is still structurally sound and just feels a bit hard. A topper adds surface comfort. It cannot restore support to a core that has already bottomed out, because the topper compresses into the same hollow. If your hand reaches the base when you press down, you need a new mattress, not a topper.
How thick should a caravan mattress be for back support?
Most caravan buying guides suggest 75 to 100mm so it clears cupboards and window sills, but thickness matters far less than density. A 100mm mattress at 50 kg/m3 supports far better than a thicker one at 28 kg/m3. Measure the clearance above your bed base, tell us the number, and we confirm the right depth before anything ships.
Sore back after every trip? Start with the Revive. It is our memory foam build, made for exactly this complaint, and it comes with a 365-night trial and a 10-year written warranty. If it does not fix your mornings, you have a year to tell us.
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