Pocket springs are steel coils sealed in individual fabric pockets so each one moves alone. Here is how they are built, what coil count and gauge really mean, and who they suit.
A pocket spring mattress uses steel coils that are each sealed inside their own fabric sleeve, so every spring compresses on its own instead of dragging its neighbors with it. That single design choice is what separates a modern hybrid from a traditional innerspring, and it is why pocket coils have taken over the middle and upper end of the mattress market.
You will also see them called pocketed coils, encased coils, wrapped coils or Marshall coils. All four terms describe the same thing.
Each coil is a barrel-shaped or cylindrical steel spring, dropped into a non-woven fabric pocket that is then sealed. The pockets are joined edge to edge, usually with adhesive or ultrasonic welding, to form a honeycomb sheet the size of the mattress. That sheet becomes the support core, and comfort layers of foam, latex, wool or fiber go on top.
Compare that with a traditional Bonnell or open coil unit, where every spring is laced to the ones around it with a helical steel wire. In a connected unit, pressing down in one spot pulls a wide area down with it. In a pocketed unit, the coil under your hip compresses and the coil two inches away barely moves. Our guides to Bonnell springs and open coil units cover the older designs in detail.
Pocketed coils are not new. James Marshall patented the wrapped-coil idea in the early 1900s, which is why they are still sometimes called Marshall coils. What changed is manufacturing: sealing thousands of individual fabric pockets was slow and expensive until automated machinery made it cheap. That is why a construction from 1900 only became mainstream in the last few decades.
Three specs get quoted, and they are not equally useful.
Coil count is the number of springs in a queen-size unit. More is not automatically better. Manufacturers can raise the count by using smaller, thinner coils, which is a downgrade dressed up as an upgrade. Counts in the several-hundred range are typical for entry-level units and roughly a thousand or more for premium ones, but the number only means something when you hold coil size and wire gauge constant.
Coil gauge is the thickness of the steel wire, and the scale runs backwards: a lower number means thicker wire. Thicker wire is firmer and more durable, thinner wire is softer and more responsive to light pressure. Gauge tells you more about how a bed will feel and last than count does.
Zoning means using firmer coils under the hips and lower back and softer coils under the shoulders and legs. On a pocketed unit this is easy to do because the coils are independent, and it is one of the genuine advantages of the design. Zoned support helps side sleepers most, since it lets the shoulder drop while still holding the hips level.
The spec nobody prints is the one that matters most: the quality and thickness of the comfort layers above the springs. An excellent coil unit under half an inch of cheap foam will still feel like a cheap mattress.
This is the headline benefit. Because the coils are not linked, movement does not travel across the bed the way it does on a connected-coil unit. If your partner gets up at 5 a.m. or turns over four times a night, a pocket spring mattress absorbs most of that. It is not quite as quiet as dense memory foam, but it is dramatically better than any open coil bed.
Independent coils follow the curves of your body: they compress under the heavy points and stay extended under the light ones. You get real pressure relief at the shoulder and hip while still resting on top of the mattress rather than in it. For people who want the support of foam without the enveloped sensation, this is usually the right answer.
A coil unit is mostly open space, so warm air moves out instead of collecting under you. In a Los Angeles bedroom in August, that matters. A pocket spring hybrid will almost always sleep cooler than an all-foam mattress at the same price point.
Better units add firmer or doubled coils around the perimeter, so the edge holds up when you sit on it to put on shoes and you can use the full width of the bed. This is not automatic, so ask specifically. Our guide to mattress edge support explains how to test it in a showroom.
Pocket coil hybrids come in nearly every firmness, which makes them the most flexible category on the floor. Side sleepers, back sleepers, couples with different preferences and heavier sleepers can all usually be fitted with one.
Encasing coils individually costs more than lacing them together, so pocket spring beds start higher than basic innersprings. Expect mid-range to premium pricing. The counterargument is durability: a well-made pocketed unit usually outlasts a cheap open coil bed by several years, which changes the cost per year of ownership.
Steel coils plus thick comfort layers add up. A queen pocket spring hybrid is heavy and awkward, which makes rotating it a two-person job and moving it a genuine chore. Nearly all modern pocket coil mattresses are single-sided, so you rotate head to foot rather than flipping.
The fabric pockets keep the coils from rubbing directly against each other, so these units start out quiet and stay quiet far longer than laced coils. But steel is steel: after many years, some units do develop a squeak, usually from a failing foundation rather than the mattress itself.
If what you want is the slow-sinking, molded-around-you sensation, coils will not deliver it no matter how many there are. That feel comes from viscoelastic foam. A hybrid with a thick memory foam comfort layer gets partway there, but it is a compromise between the two.
| Feature | Pocket spring | Memory foam | Open coil |
|---|---|---|---|
| Motion isolation | Very good | Excellent | Poor |
| Cooling | Very good | Depends on cover and design | Very good |
| Contouring | Good, surface level | Deep | Limited |
| Bounce and ease of movement | Good | Low | High |
| Edge support | Good with reinforcement | Moderate | Variable |
| Typical price tier | Mid-range to premium | Mid-range to premium | Entry level |
A pocket spring mattress is likely right if you share a bed and one of you moves, you sleep hot, you are a side or combination sleeper, you want pressure relief without feeling stuck in the mattress, or you and your partner disagree about firmness and need a zoned middle ground.
Look at other options if your budget rules out the mid-range entirely, in which case a firm open coil bed gives more support per dollar, or if you specifically want deep memory foam contouring, in which case an all-foam bed is the more direct route.
At LA Mattress Store, pocket coil construction runs through most of our hybrid collection, including Helix, Brooklyn Bedding, Birch, Stearns & Foster, Chattam & Wells and Spring Air. Browse medium-firm mattresses if you want the most broadly comfortable starting point, or pillow top mattresses if you want a plusher surface over the coils.
They are individual steel coils, each sealed inside its own fabric pocket, joined together to form the support core of the mattress. Because each coil is isolated from its neighbors, it compresses independently, which is what gives pocket spring mattresses their contouring and motion isolation.
Neither is better across the board. Pocket springs win on airflow, bounce and ease of movement, and they suit people who dislike sinking into a bed. Foam wins on deep contouring and motion isolation. Most buyers land on a hybrid, which puts foam comfort layers on a pocket coil core to get some of both.
Coil count alone is a poor quality signal. Several hundred coils in a queen is typical at entry level and roughly a thousand or more at the premium end, but a moderate count of thick, well-made coils outperforms a high count of thin ones. Ask for the gauge alongside the count, and weigh the comfort layers above the springs at least as heavily.
They are much quieter than laced coil units, because the fabric pockets keep the springs from grinding against each other. Squeaking in a pocket coil bed usually traces back to the bed frame or a worn foundation rather than the mattress. Check the base before assuming the mattress has failed.
A well-built pocket coil hybrid typically outlasts a budget open coil mattress by several years. As with any mattress, the comfort layers usually give out before the coils do, so replace it when you notice persistent body impressions or start waking up sore. Rotating it head to foot a few times a year helps it wear evenly. See our guide to how long mattresses last.
Many can, but not all. The mattress has to be flexible enough to bend at the head and foot without damaging the coil unit, and manufacturers state this explicitly. Check the product specification before pairing one with an adjustable base, because using an incompatible mattress can void the warranty.
Coil counts and gauge numbers describe a mattress the way a recipe describes a meal. Ten minutes lying on a pocket coil hybrid next to a traditional innerspring will tell you more than any spec sheet, particularly if you bring whoever you share the bed with and test motion transfer directly.
Visit any of our five Los Angeles showrooms, or take the sleep quiz to narrow things down first. Same-day delivery is available across most of the LA area, and every mattress comes with our 120-night comfort guarantee.
Related reading: Pocket Coil vs Innerspring and What Is a Hybrid Mattress?
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