Do new memory foam mattresses smell?

Yes, for 2 to 7 days after unboxing. The smell is off-gassing from the polyurethane manufacturing process (called VOCs, volatile organic compounds). Open windows in the room, leave the mattress to expand without bedding for 48 hours, and the smell fades. CertiPUR-US or OEKO-TEX certified foams emit fewer VOCs and the smell clears faster.

Who should not buy a memory foam mattress?

Hot sleepers, stomach sleepers, and anyone with reduced mobility who needs to roll easily. Memory foam traps heat (1 to 2C warmer than pocket-sprung), softens under the abdomen of stomach sleepers and pushes the lower back into a curve, and the hug makes turning over harder for older sleepers. Hybrid pocket-sprung with a foam comfort layer suits these groups better.

Memory foam vs latex: what's the difference?

Memory foam (polyurethane) is heat-responsive: it softens under body warmth and contours slowly. Latex (natural or synthetic rubber) is bouncier, cooler and faster to recover when you move. Latex lasts 12 to 15 years to memory foam's 7 to 10. Latex costs 50 to 100% more for the same size. Both are foams; they sleep noticeably different.

Can memory foam mattresses go on adjustable bed frames?

Yes, most modern memory foam (and hybrid) mattresses are designed for adjustable bases. The foam flexes without cracking. Avoid pure latex on adjustable frames; the latex fights the bend. Check the mattress warranty too: some pocket-sprung models void warranty when used on adjustable bases, but memory foam typically does not.

How firm is a "medium-firm" memory foam mattress?

6 to 7 on the UK 1-to-10 firmness scale. Medium-firm is the most-bought spec because it suits back sleepers, side sleepers up to 90kg, and most couples. Below medium-firm (4 to 5) is for lighter sleepers and side-sleeping only. Above firm (8-plus) is for heavier sleepers and back-pain support. Most retailers list firmness on a number scale; if not, ask before ordering.

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Updated 31 May 2026

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