What makes memory foam unique#
Memory foam (viscoelastic foam) responds to body heat and pressure, moulding to your exact body shape. When you move, it slowly returns to its original form. This viscoelastic behaviour is quite different from both latex (which bounces back quickly) and pocket springs (which push back against you).
Memory foam was invented by NASA in the 1960s for aircraft seat cushions. Tempur was the first company to adapt it for consumer mattresses in the 1990s. Today it appears in hundreds of UK mattress products in pure foam or hybrid form.
The genuine advantages of memory foam#
- Excellent pressure relief: Memory foam distributes your weight evenly, reducing pressure at the hips, shoulders and knees. This makes it particularly good for people with joint pain or those who wake with pressure-related discomfort.
- Outstanding motion isolation: Memory foam absorbs movement rather than transferring it. If you share a bed, you're far less likely to be disturbed when your partner moves. This is memory foam's most significant practical advantage for couples.
- Good body contouring: The close contouring keeps your spine aligned, which benefits back sleepers and side sleepers particularly.
- Quiet: Memory foam is completely silent, no spring noise.
- Durability: High-density memory foam (4+ lbs/ft³ or 65+ kg/m³) is very durable, with a lifespan of 8–10 years.
The real limitations of memory foam#
- Heat retention: This is memory foam's primary drawback. Traditional memory foam traps heat because it has a closed-cell structure with little airflow. Hot sleepers often find all-foam mattresses uncomfortable, particularly in summer. Gel foam and open-cell foam address this partially, but hybrids with pocket spring bases are significantly cooler.
- Off-gassing: New memory foam mattresses often emit a chemical smell (VOCs) when first unpacked. This is harmless but unpleasant, and typically dissipates within 24–72 hours. Rolling in fresh air speeds the process.
- Slow response: The slow return of memory foam can make it feel "sticky" when changing positions, which some sleepers find frustrating, particularly combination sleepers who move frequently.
- Weight: All-foam mattresses are heavier than sprung mattresses and awkward to move or rotate.
- Feels different in cold weather: Memory foam firms up in cold temperatures. If your bedroom is very cold in winter, the mattress may feel noticeably firmer than expected in summer.
Who should buy a memory foam mattress?#
Memory foam is ideal for:
- Side sleepers who need pressure relief at the shoulder and hip
- Couples where one partner is a restless sleeper (motion isolation)
- Joint pain or arthritis sufferers
- Lighter sleepers (under 14 stone/90kg) who won't sink too deeply
- People in cold climates (the added warmth is a feature, not a bug)
Memory foam is less ideal for: hot sleepers, heavier individuals, those who prefer a bouncy or responsive feel, and combination sleepers who change position frequently.
The memory foam mattresses we have scored#
Memory foam ranges from a £109 budget slab to a £469 dense block with a 200-night trial, and the pros and cons above apply differently across that range. Here is the field.
| Model | Type | Depth | Feel | Support | Comfort | Price (double) | Why it is here |
|---|---|---|---|---|---|---|---|
| Westwood Memory Foam | Foam | 18cm | Medium | 7.8 | 8.0 | £109 | Budget entry; softens sooner |
| Core CoolMax Memory Foam | Foam | 15cm | Medium | 8.0 | 8.3 | £147 | Wicking cover addresses the heat problem cheaply |
| Superior Cashmere | Foam | 23cm | Medium | 8.5 | 8.8 | £198 | Dense foam, best value in the type |
| Emma Original Lite | Foam | 20cm | Medium | 7.6 | 8.0 | £246 | The cheapest trial-backed foam |
| Emma Original | Foam | 25cm | Medium | 8.4 | 8.9 | £469 | The reference memory foam mattress; best motion isolation |
| Reverso Memory | Foam | 25cm | Soft | 7.4 | 8.2 | £329 | Foam over springs: keeps the feel, loses the heat |
Prices are for a double at the time of writing (September 2026), using the sale price where the brand runs a permanent one. Full scores are on each review page. We may earn a commission if you buy through our links, at no extra cost to you; it never affects a score.
The two biggest cons, heat and slow response, are largely solved by putting the foam over springs, which is what the Reverso Memory does. If you love the memory foam feel but have been put off by the drawbacks, that is the mattress to try. Our foam vs hybrid comparison goes further.
Frequently asked questions#
Is memory foam good for side sleepers?#
Yes, it is the type most side sleepers prefer, because it lets the shoulder and hip sink while supporting the waist. Lighter side sleepers should choose a softer foam; heavier ones a denser, firmer one so the hips do not bottom out.
Does memory foam make you hot?#
Traditional memory foam does; it absorbs body heat and reflects it back. Open-cell foams, gel infusions, wicking covers and a spring layer beneath all help. Very hot sleepers are usually better with latex or a hybrid.
Is memory foam bad for your back?#
Not if it is firm and dense enough for your weight. Problems arise when soft, low-density foam lets the hips sink too far and the spine bows. A medium-firm foam of 50kg/m³ or more, or a zoned foam, suits most backs.
How long does a memory foam mattress last?#
Eight to ten years for dense foam (50kg/m³ upward); five to seven for budget foam under 40kg/m³. Memory foam fails by softening and forming body impressions rather than by breaking.
Related reading#
- Best memory foam mattress UK – the field ranked
- Is memory foam bad for your back? – the worry examined
- Memory foam vs hybrid – the fix for foam's weaknesses
- Materials and temperature – why foam sleeps warm
- Memory foam collection – every foam mattress we score
