You spend around a third of your life on your mattress, so few purchases matter more to how you feel day to day. Yet with so many types, firmness ratings and claims to wade through, choosing one can feel bewildering. This guide cuts through it: the main mattress types and who they suit, how to judge firmness for your sleeping position, and the practical things — like motion transfer and temperature — that make the difference between an average night and a great one.
1. Why your mattress matters
A good mattress supports your spine in its natural alignment, relieves pressure on your hips and shoulders, and lets you sleep through the night without tossing and turning. The wrong one does the opposite — leaving you waking stiff, achy and unrested, however early you went to bed. It’s genuinely worth investing properly here, even if it means spending a little more, because a quality mattress pays you back every single morning for years.
2. The main mattress types
Most mattresses fall into one of four families, each with a distinct feel:
- Pocket sprung — individual springs sewn into fabric pockets that move independently, contouring to your body and supporting it evenly. Breathable, responsive and a brilliant all-rounder; generally, the more springs, the more precise the support.
- Memory foam — moulds to your shape and relieves pressure points, making it a favourite for achy joints and bad backs. It absorbs movement superbly, though denser foams can sleep warm.
- Hybrid — pocket springs topped with memory or comfort foam, combining the support and airflow of springs with the cushioning of foam. A safe, popular choice if you’re unsure which way to lean.
- Open coil — a traditional single-wire spring system; budget-friendly and supportive, but the springs move together, so it transfers more movement than pocket sprung.
3. Firmness & sleeping position
Firmness is the most misunderstood part of buying a mattress. It’s a matter of feel and support, not quality — a soft mattress isn’t worse than a firm one, it’s just right for different people. The goal is simply to keep your spine in a natural, neutral line: not sagging into something too soft, nor pressing against something too hard. Firmness is usually rated on a scale from soft through medium and medium-firm to firm, and the right rating depends mostly on how you sleep and your body weight.
4. Match firmness to how you sleep
Your usual sleeping position is the best starting point for firmness:
| You sleep on your… | Best firmness | Why |
|---|---|---|
| Side | Medium to medium-firm | Lets hips and shoulders sink in just enough to keep the spine straight |
| Back | Medium-firm | Supports the lower back while cushioning pressure points |
| Front | Firm | Stops the hips dropping and the lower back arching |
| Combination | Medium-firm | A versatile middle ground for those who move during the night |
Body weight matters too: heavier sleepers generally want firmer support for lasting alignment, while lighter sleepers often find a softer feel more comfortable. If you suffer with back pain, medium-firm is the most commonly recommended starting point — supportive but with enough give to cushion you.
5. Couples & motion transfer
If you share a bed, two things are worth thinking about. First, motion transfer — how much you feel your partner move. Pocket sprung and memory foam both isolate movement far better than open coil, so a restless partner is much less likely to wake you. Second, differing preferences — if one of you likes it firm and the other soft, a zip-and-link mattress (two singles that zip together on one base) lets each side have its own firmness, and splits into two singles for guests. Otherwise, a medium-firm hybrid is the usual happy compromise.
6. Sleeping temperature
If you tend to overheat at night, the mattress can help or hinder. Dense memory foam holds more heat as it hugs your body, so if you sleep hot, lean towards pocket sprung or a hybrid with breathable layers, where air can circulate through the springs. Natural fillings such as wool and cotton, and covers designed to be cooling or temperature-regulating, also help wick warmth and moisture away. Conversely, if you’re always cold, memory foam’s snug, heat-retaining hug can be a cosy plus.
7. Size & base
The bigger the mattress, the better most people sleep — a standard double gives two adults only 67.5cm of width each, narrower than a single, so couples with the room often love upgrading to a king. Always buy a UK-size mattress to match your UK-size frame, and make sure the mattress suits your base: slatted frames need slats no more than around 7cm apart for proper support, while ottoman and divan bases work with any standard mattress. If you’d like a fuller breakdown of every UK size, see our Bed & Mattress Size Guide.
8. Care & lifespan
Most mattresses should be replaced around every 7–8 years, by which point they’ve lost support and gathered dust and allergens. To get there in good shape: use a mattress protector from day one to guard against spills, sweat and dust mites; rotate the mattress head-to-toe every few months (and flip it too if it’s double-sided) so it wears evenly; and air it occasionally by pulling back the covers. Signs it’s time for a new one include visible sagging or dips, lumps, springs you can feel, or simply waking up achy and unrested.
9. Buying with confidence
Every Elystra mattress comes with fast delivery, a 30-day returns promise and the option to spread the cost with Klarna in interest-free instalments. Pick the type that suits you, match the firmness to how you sleep, factor in your partner and your temperature, and invest properly in the part of your home that does the most for how you feel. Browse our full range of mattresses to find yours.
Frequently asked questions
Which type of mattress is best?
There’s no single best type — it depends on you. Pocket sprung is a breathable, supportive all-rounder; memory foam excels at pressure relief and motion isolation; hybrids blend both and suit the widest range of sleepers. If you’re unsure, a hybrid is the safest starting point.
What mattress firmness is best for back pain?
Medium-firm is the most commonly recommended starting point for back pain — supportive enough to keep the spine aligned, with enough give to cushion pressure points. Your sleeping position and body weight also matter, so check each mattress’s firmness rating.
What firmness should a side sleeper choose?
Side sleepers usually prefer medium to medium-firm, which lets the hips and shoulders sink in just enough to keep the spine straight. Too firm and it presses on the shoulder; too soft and the spine sags out of line.
Does a memory foam mattress sleep hot?
Dense memory foam can sleep warmer because it hugs the body and holds heat. If you tend to overheat, choose pocket sprung or a hybrid with breathable layers, or look for cooling covers and natural fillings that help air circulate and wick warmth away.
How do I stop feeling my partner move in bed?
Choose a pocket sprung or memory foam mattress — both isolate movement far better than older open-coil designs, so you’re much less likely to feel a restless partner turn over. A larger size such as a king also gives each person more space.
What is a zip-and-link mattress?
It’s two single mattresses that zip together on one base, so each side can have its own firmness — ideal for couples with different preferences. Unzipped, it splits into two singles, which is handy for guest rooms.
How firm should a new mattress feel?
A new mattress often feels firmer than expected for the first few weeks while it settles and your body adjusts to it. Give it a short break-in period before judging the comfort. If it still feels wrong after that, it may not be the right firmness for you.
How often should I replace my mattress?
Around every 7–8 years. Replace sooner if you notice sagging, lumps or springs you can feel, or if you regularly wake up stiff and unrested. Using a protector and rotating it regularly helps it reach a full lifespan in good condition.
Can I put any mattress on a slatted bed frame?
Most mattresses work on a slatted frame, but the slats should be no more than around 7cm apart to give proper, even support — especially for memory foam and foam-based mattresses. Always match a UK-size mattress to a UK-size frame.
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