Pocket spring is the construction that built the British mattress industry and still dominates the premium end of the UK market. Most of the brands you'd recognise as heritage names (Hypnos, Harrison Spinks, Vispring, Sleepeezee, Relyon) build their flagship mattresses around pocket springs, and most of the mid-market (Silentnight, Sealy, Rest Assured) follows the same approach with different tiers of finish. Buying a pocket spring mattress is one of the safer decisions you can make in the category, provided you know what to look for and which claims on the spec sheet are worth paying attention to.
The mattress industry is full of marketing language that tells you very little about how the thing will feel when you lie on it. Pocket spring is one of the few terms that actually means something specific, and the differences between a poor pocket spring mattress and a good one come down to a handful of measurable things instead of the fuzzy comfort claims you see on most product pages.
What a Pocket Spring Mattress Actually Is
Each individual spring is sewn into its own fabric pocket, which is where the name comes from. That single construction difference separates pocket spring from the older open coil system (where springs are connected to each other with rigid wire frames) and from foam-only mattresses that have no springs at all. The reason it matters: when springs work independently, they respond to pressure exactly where it's applied instead of dragging their neighbours along with the movement.
Press your hand into a pocket spring mattress and you can feel the springs reacting locally. Press your hand into an open coil equivalent and the whole surface moves as one. That difference shapes everything about how the two construction types feel to sleep on. It also shapes how well each one supports a body, because bodies aren't uniform weights distributed evenly across a mattress. Hips are heavier than shoulders. Shoulders push into the mattress more than feet. A spring unit that can respond to those differences individually delivers better spinal alignment than one that can't.
Above the pocket spring base sits the comfort layer, which varies enormously between brands. Natural fillings (wool, cotton, cashmere, horsehair) on the heritage end. Memory foam or modern alternatives on the mainstream end. Latex on the specialist end. What's underneath is the same basic construction in all these cases - what's on top is where the feel comes from.
Why Pocket Spring Beats Open Coil
Open coil mattresses are still sold, usually at the budget end of the market. They typically contain 200-400 springs in a king size, which is a fraction of what pocket spring models deliver. More importantly, the springs are physically connected to each other through a rigid wire frame. Push on one spot and the whole frame shifts. That works against proper body support in two ways: you get uneven distribution across the mattress, and your partner's movements transfer across the whole bed instead of staying on their side.
The price advantage is the only real argument for open coil at this point, and even that is smaller than it used to be. Budget pocket spring mattresses exist now at prices that overlap with decent open coil alternatives, which means there's rarely a good reason to buy open coil unless you're furnishing a guest room on the tightest possible budget. For a mattress you'll actually sleep on every night, pocket spring is the starting point.
Spring Count Demystified
Spring count is the metric most buyers fixate on and the one that's most commonly misunderstood. A king-size pocket spring mattress can have anywhere from 800 springs at the budget end to 14,000+ on multi-layer premium models. The number on its own doesn't tell you whether a mattress is good. What matters is whether the springs are properly sized and properly tensioned for the construction.
As a rough guide: under 1,000 springs on a king size is entry tier. 1,000 to 2,000 is mid-market. 2,000 to 3,000 is upper mid to premium. 3,000+ is proper premium territory, and above 5,000 you're usually into multi-layer construction where two separate spring units stack to deliver the headline count. The sweet spot for most buyers sits around 1,500 to 2,500 springs, which is where you get proper independent support without paying for diminishing returns from the highest spring counts.
The idea that more springs automatically means a firmer mattress is a myth. Firmness comes from the individual spring tension and the comfort layer above, not from the count. A 3,000 spring mattress can be soft. An 800 spring mattress can be firm. Don't assume one follows from the other.
Where Pocket Spring Actually Shines
Airflow and temperature management. The gaps between pocket springs let heat move through the mattress instead of sitting where your body warmth builds it up. Pocket spring mattresses sleep cooler than foam-only alternatives at every price tier, which matters if you run warm or if you're shopping for a partner who does.
Edge support. A properly built pocket spring base holds its shape all the way to the sides, which matters if you sit on the edge of the bed in the morning or if you're a restless sleeper who ends up near the edges through the night. All-foam mattresses sag at the perimeter. Good pocket spring mattresses don't.
Longevity. A pocket spring base will typically outlast a foam-only mattress by several years. The springs don't soften the way foam does, so the structural support stays consistent even as the comfort layer above slowly wears. Premium heritage pocket spring mattresses can still feel right at year fifteen with proper care, which is where the cost-per-night maths starts to favour the category.
Honest firmness. Pocket spring tension is measurable and repeatable. Foam mattresses soften when they warm up, which means the firmness you feel on night one isn't necessarily the firmness you get by night twenty. A pocket spring mattress at medium tension stays at medium tension through the whole night, every night.
Where Pocket Spring Falls Short
Honest about the downsides. Pocket spring mattresses are heavier than foam alternatives, which makes delivery more involved and rotation a two-person job on the larger sizes. They're usually more expensive at like-for-like specification. And the cheaper end of the pocket spring market can still transfer some movement between sleepers if the spring count is too low or the comfort layer is thin, so motion isolation isn't automatically a strength - it depends on the build.
If you want the deep enveloping foam-hug feel, pocket spring isn't the category. The spring response underneath always breaks up the contouring slightly, which is why people who specifically love memory foam often don't gel with pocket spring hybrids. Worth being clear about that distinction because the feel really is different.
Who Makes the Springs
Most British mattress brands buy their pocket spring units from dedicated spring manufacturers, Leggett & Platt being one of the largest suppliers globally and a company that counts most of the UK bed trade as customers. A handful of heritage brands make their own springs in-house - Harrison Spinks is the obvious example, with a fully vertically integrated supply chain that includes their own spring production - which is part of what justifies their premium pricing.
For most buyers, who makes the springs matters less than how well the finished mattress is built. Two mattresses with the same supplier spring unit can feel completely different depending on spring count, gauge, comfort layer and construction quality. Worth being clear on the spring supplier for context, not worth getting hung up on.
Brands We'd Pick for Pocket Spring Mattresses
- Sleepeezee Regency range - the Kew 2800 and Kennington 4200 are two of the most consistently well-reviewed mid-to-upper pocket spring mattresses on the UK market. Made in Rochester, Kent since 1924, and the 60 night home trial on selected models is an unusual concession from a heritage brand where most competitors don't do trials at all.
- Hypnos Hemsworth / Luxurious Earth - the accessible entry into the Hypnos range, with high-count pocket springs and proper natural filling comfort layers. Royal Warrant pedigree, hand-built in Castleford, Yorkshire. The standard British premium reference point.
- Harrison Spinks Somerset / Yorkshire range - fifth-generation family business with their own 300-acre farm producing wool and hemp for the comfort layers. In-house spring manufacturing. The vertical integration shows up in the finished mattress quality and the premium pricing reflects that.
- Vispring Herald Superb / Signatory - Plymouth-based premium brand with vanadium steel springs, natural fibre fillings and a 30 year guarantee. The benchmark the rest of the British premium category measures against.
- Flaxby Master's Guild - sold through Dreams but actually made by Harrison Spinks. Offers Harrison Spinks quality at more accessible pricing through Dreams distribution, which is one of the better value propositions in the heritage pocket spring category.
- Silentnight Mirapocket - accessible mid-market pocket spring from the UK's biggest mattress manufacturer. Honest firmness labelling and showroom availability through John Lewis, Argos and independent retailers. A sensible starting point for buyers who want pocket spring at mainstream pricing.
- Sealy Posturepedic - zoned pocket spring technology endorsed by the Orthopedic Advisory Board. Made in Aspatria, Cumbria, available through Dreams, Bensons and John Lewis. The Bronte and Newton sit at the mid-tier where most buyers end up.
- Dream Team Gold range - exclusive through Mattress Online, consistently strong reviews from UK buyers at the mid-to-upper tier. The Crowborough 10000 is the headline model with one of the highest advertised spring counts in the category.
- Staples of Somerset - traditional hand-built pocket spring mattresses at accessible pricing through independent bed specialists. Below the heritage brand radar but delivering similar construction quality at a lower tier.
How We Test Pocket Spring Mattresses
For pocket spring specifically, we check four things that matter more than marketing copy. First: how the individual springs react under localised pressure. Press a hand into the surface and see whether only the area under the hand moves, or whether you can feel the adjacent springs pulling with it. That tells you how well the pocket construction is actually doing its job. Second: edge support. Sit on the side of the mattress for a minute or two and check whether it holds or dips. Cheap pocket spring builds often have weaker edges than the middle, which creates a soft ring around a firm core. Third: the comfort layer integration. Some mattresses have proper tufted natural filling layers that sit flush against the spring unit. Others have a thin quilted polyester layer that feels disconnected from the springs underneath. The difference shows up in the long-term feel. Fourth: how the firmness settles over a fortnight. Pocket spring tension stays consistent overnight, but the surface comfort layer can soften slightly in the first couple of weeks as the fillings settle. A good mattress settles into a stable feel. A poor one keeps changing.
