Pocket springs give separately under your hips and shoulders
Pocket springs support different parts of your body separately because each spring compresses inside its own sewn fabric pocket. Your hips put more weight into the surface than your shoulders, so local give matters. You need room to sink a little where you're heavier without pulling the surrounding mattress down with you.
With open coil, also called Bonnell, the springs are wired together through a frame. Press one part and the connected springs move too. With pocket springs, the load stays more local. That's the useful difference underneath all the upholstery and the showroom lighting, which I always think deserves its own acting award.
A 2011 experimental sleep study by Verhaert and colleagues compared sleep systems that kept the spine aligned with a sagging system.1 The sagging system worsened measured sleep quality for people sleeping on their front or side. The comparison concerned spinal alignment and sagging. To my mind, keeping the whole bed properly supported is worth far more attention than the decorative stitching.
Pocket springs still need the right tension and enough comfortable material above them. You can put a thin, hard top over a decent spring unit and end up with a bed you dislike. The word "pocket" isn't permission to stop reading, tempting though that would be after your third showroom visit. Check how far your hips sink and whether your shoulder has enough room when you lie in your usual position.
Pocket springs are worth choosing over open coil for your everyday bed
Choose pocket springs for a bed you use every night, especially if you share it: the separate springs reduce how much movement travels across the mattress. Your partner can turn over without taking quite so much of your side along. If their bedtime routine includes a full rehearsal for escaping the duvet, that difference is worth having.
The comfort layers affect movement too, so separate springs won't make every mattress equally still. Foam above the springs absorbs movement; a more responsive top lets you move more freely. Try both sides of a mattress together if you're shopping as a couple. One of you lying perfectly still while the other sits politely on the corner tells you very little about an actual night.
Open coil's other drawback is the shared dip. The connected structure gives across a wider area, and once the middle sags you can end up rolling towards the same trench. I think a double is quite close enough without paying extra for compulsory cuddling. Avoid a bed that slopes you towards the centre or pulls you towards your partner when they lie down.
Price used to make the case for open coil much easier. Pocket springs now reach the budget end too, including rolled mattresses, so compare the actual construction before assuming open coil is the only affordable option. The price argument has shrunk; your budget still matters. There is no sense stretching yourself financially for fillings you don't need.
For a lightly used guest bed, open coil is a reasonable economy. For your own bed, look for a straightforward pocket-sprung build before accepting a connected spring frame. Ex-display mattresses are also worth asking about when shops change their ranges, provided you can inspect the condition and understand the sale terms. I keep open coil out of the search for a child's everyday mattress too.
A bigger spring count does not mean a firmer or better mattress
Once you're above roughly 1,500 springs in a king, stop treating the total as a reason to buy and look at the wire thickness, spring layers and fillings. That's my buying rule of thumb. The industry's enthusiasm for adding another zero is considerably greater than mine.
A king can contain fewer than a thousand springs at the budget end or many thousands in a multi-layer build. Those totals can describe quite different arrangements. One mattress might have a main support unit; another might add layers of smaller springs above it. When every layer goes into the headline total, a much bigger count doesn't necessarily mean more springs across the surface supporting you.
Ask how the total is divided between the main spring unit and any smaller spring layers. Extra layers have a construction purpose, but you need to know what that purpose is. "More" is a remarkably short answer for something that takes two people to carry upstairs.
Spring count also doesn't set firmness. Firmness comes from the spring tension and what sits above the springs. Gauge describes the thickness of the wire, which helps you understand the spring unit, but the feel of the finished mattress includes the top layers too. A high-count mattress can feel soft; a lower-count one can feel firm.
Compare counts for the same mattress size, because a larger mattress has room for more springs. Then ask about the main unit's tension and the depth and type of fillings. If the sales pitch returns to the grand total every time you ask what's inside, keep asking. You're buying somewhere to sleep, not entering a maths competition.
The fillings, spring maker and base matter more than the badge
Choose the top layers for how you want to feel in bed, then check who makes the spring unit and what will support it underneath. Springs provide the underlying give; the fillings change how closely you sink, how easily you turn and how warm the surface feels. You spend the night against the top of the mattress, so it deserves more attention than the embroidered logo.
Choose the surface by feel and warmth
Wool and cotton are the fillings I favour if you sleep hot. They buffer moisture and suit a more breathable build. You'll also find cashmere and horsehair at the heritage end of pocket-sprung mattresses. A glamorous fibre name is lovely dinner-party material, if your dinner parties have taken a very particular turn, but check what else is in the mattress and how much cushioning you actually get.
Foam gives you a closer-fitting surface, and memory foam is particularly useful for reducing partner movement. The trade-off is warmth and, with deeper slow-response layers, the effort of turning over. If you already push the duvet off during winter, choose springs with natural fillings before buying into a cooling-cover promise. Open-cell foam is another mainstream option, but the foam's structure is only part of the whole bed's feel.
Latex is the specialist option I wish more people tried. It has a springier feel than slow-response memory foam, so you can change position without that sinking-in sensation. The price is the less charming part. Try latex if you want cushioning with an easier turn, and compare it with a simpler natural-filled pocket mattress before committing.
Know the maker, then look beyond the name
Harrison Spinks makes its own springs and grows some of its own fillings, while most British brands buy spring units from specialist spring makers. In-house production gives the maker control over those parts of the build. Bought-in units can still be good; the important question is what unit and fillings you're getting.
Vispring, Hypnos, Relyon and Sleepeezee are heritage names you'll meet while shopping. I think Hypnos, Vispring and Harrison Spinks make genuinely better-built mattresses with good staying power. Whether you need that level of construction is another question. A sensible mid-range pocket mattress gets most people a long way, without a household discussion about whether the spare room really needs curtains.
Silentnight and Sealy are the volume names, and I find their ranges bland. I prefer spending on a plainer-labelled mattress with a stronger construction for the money. That is a reason to compare the actual build carefully, though, rather than assuming any heritage badge makes every model the right purchase for you.
Choose tension for your weight before your sleeping position
Start with your weight, then adjust for how you sleep. A lighter person compresses the same mattress less, so a surface someone else calls comfortably firm can feel like a plank. Brand firmness labels vary too. Treat them as a rough guide within that brand and lie down before trusting the adjective.
These are my comfort guidelines, not clinical thresholds. The weight bands are approximate, and your usual sleeping position affects the choice.
| Your weight or sleeping habit | Where to begin | What to check when you lie down |
|---|
| Under about 9 stone | A softer tension, especially on your side | Your shoulder and hip should sink a little without you feeling perched on top. |
| About 9 to 18 stone | Medium-firm, with a softer comfort layer for side sleeping | Your hips should settle without dropping much lower than the rest of you. |
| Over about 18 stone | A firmer, thicker build with a stronger spring gauge | You should be able to turn easily without sinking deeply through the comfort layers. |
| You and your partner need very different feels | Split tension or zip-and-link | Each side should suit the person sleeping on it. |
Spend a full ten minutes lying in the position you actually sleep in. The polite showroom perch is excellent for keeping your shoes visible and fairly useless for choosing a mattress. Use that time to rule out pressure at your shoulder, excessive sinking at your hips or difficulty turning. A home trial is more useful for judging the longer experience, so read the collection and refund conditions before ordering.
For couples, check the edge as well as the middle. A soft, collapsing edge reduces the space you can comfortably use, which matters especially on a double. Sit where you'd get dressed, then lie near the side. The edge should feel secure enough for how you use the bed.
Give a heavy mattress a sound base
A pocket spring mattress needs an even, supportive base, so check underneath your old mattress before ordering the new one. A divan is a straightforward choice; for slats, I look for gaps no wider than about seven centimetres, subject to the mattress maker's requirements. An old dipped base shapes the mattress above it.
Rotate the mattress every few months, following its care instructions, so you aren't always loading the same area. Flip it only if it's double-sided. Pocket spring mattresses are heavy, and rotating a king is a two-person job. This is one household task where "I'll just do it quickly" is an unnecessarily ambitious opening line.
Avoid these shortcuts when you buy pocket springs
Reject a weak overall build even if the spring unit sounds impressive. A good component underneath poor cushioning is still a poor place to spend your night. I wouldn't pay for a respectable spring unit just to lie on a skimpy polyester top.
- Open coil for your everyday bed. The wired springs transfer movement across the surface. Keep looking for an affordable pocket-sprung option before settling.
- A stacked spring count sold as the whole reason to buy. Ask how many layers make up the total and what the main support unit contains.
- A thin quilted polyester top over a decent spring unit. The springs alone won't give you enough surface cushioning.
- A sparse budget pocket unit where pressing one spot moves its neighbours. You lose the local response you're choosing pocket springs for. Compare how nearby areas move when you press or lie down.
- A heavy new mattress on a base that already dips. Repair or replace the base first, because the uneven support will affect the mattress above it.
Check the comfort-return terms separately from the guarantee. You need to know whether an unsuitable feel qualifies for a refund or an exchange, and who pays for collection. The guarantee badge is the part everyone admires; the collection clause is the part you will care about while negotiating a king-sized mattress out of a bedroom.
