Choosing a Mattress for a Heavier Build

Most mattresses are built and rated for a sleeper of average weight. Above roughly 100 kg per person the assumptions stop holding, and the mattress fails in a predictable order: the edge first, then the hip, then the middle.

Why firmness ratings mislead here

A firmness number describes how the surface feels to an average build. A heavier sleeper compresses straight through the comfort layer and feels the support core, so the same mattress that is a medium to one person is a firm to another. That is why "buy firmer" is only half the advice — the comfort layer needs to be deeper as well, or you end up lying on the core.

Look at the support core, not the surface

This is the change in approach. For most buyers the comfort layer decides satisfaction; here, the core decides whether the mattress survives.

• Spring gauge. A heavier wire, not more springs. A 1,000-spring unit in heavy gauge outlasts a 2,000-spring unit in fine gauge under load.
• Support foam density. Under about 35 kg/m³ a reflex core will take a permanent set within a couple of years.
• Border and edge. A reinforced perimeter is what stops you sliding off when you sit on the side to put your shoes on — and edge collapse is the first thing to go.
• Total depth. More depth means more material sharing the load. Below about 22 cm there is not much to work with.

The Premium XXL exists for exactly this: heavier spring gauge and a denser support foam, specified for a combined sleeping weight above 160 kg.

Comfort layer: deeper, not softer

You still need pressure relief at the shoulder and hip, particularly if you sleep on your side. The answer is a deeper comfort layer over a firmer core, not a softer mattress. Five to seven centimetres of memory or latex over a heavy-gauge unit does what three centimetres over a soft one cannot.

Latex over memory foam, usually

Two reasons. Latex is more resilient, so it recovers rather than taking a set under sustained load. And it does not soften with heat the way memory foam does, which matters more when there is more of you generating it.

The base matters more than usual

A mattress specified for the load will still fail on a base that is not. Check:

• Slats no more than 7 cm apart, and thicker than 20 mm.
• A centre rail with legs on any double or larger. Missing centre support is the most common cause of a mattress that sags in the middle within a year.
• Divan bases rated for the load, not the cheapest one in the shop.

Almost every guarantee in the trade, ours included, excludes damage caused by inadequate support underneath.

If you share the bed and weights differ a lot

Two linked singles, each specified separately, is the only answer that genuinely solves it. See choosing for two people.

Common questions

Is there a weight limit on a mattress?

Reputable makers state one. If a product page does not mention load at all, that is a reason to ask rather than to assume it is unlimited.

Will a topper help?

For surface pressure, yes. For a core that is under-specified, no — it will follow the dip.

How long should it last?

Expect the shorter end of the normal range. Rotating head to foot every three months matters more here than for anyone else.