Quick Answer: A coil spring mattress uses a network of steel coils to provide support, airflow, and durability. The coil type matters more than the count alone, individually wrapped (pocketed) coils reduce motion transfer and conform better than Bonnell or continuous wire systems. Our Restonic ComfortCare Queen offers 1,222 individually wrapped coils at $1,619.
In This Guide
- The Four Main Coil Types Explained
- Coil Count: What It Actually Means
- Steel Gauge and Why It Changes Everything
- Why Coil Mattresses Win for Hot Sleepers
- Coil Support for Heavier Individuals
- Spring vs. Memory Foam: An Honest Comparison
- Real Specs: Restonic at Mattress Miracle
- Frequently Asked Questions
Reading Time: 12 minutes
Walk into any mattress showroom and you'll hear a lot about coil counts. "This one has 800 coils." "That one has 1,500." Numbers get thrown around like they explain everything. They don't.
The truth is that a coil spring mattress is a more nuanced product than most people realise. The type of coil, the gauge of the steel, the coil geometry, the zoning pattern, all of these matter more than a single number. Understanding them helps you avoid buying a mattress that feels right for the first three months and collapses by year two.
We've been fitting Brantford families into spring mattresses since 1997. In that time, we've seen every coil configuration imaginable, from bargain Bonnell units to high-end pocketed systems with individually tempered coils. This guide explains what separates the good from the mediocre, in plain language, without the marketing spin.
The Four Main Coil Types Explained
Not all coil spring mattresses are built the same way. The four dominant coil systems each have distinct characteristics, and knowing which one is inside a mattress tells you a great deal about how it will perform over time.
Bonnell Coils
Bonnell coils are the oldest and simplest design, an hourglass-shaped coil connected to its neighbours by a helical wire. This interconnected system is inexpensive to manufacture and reasonably durable in budget applications.
The downside is motion transfer. Because every coil is physically linked to the ones around it, movement on one side of the bed travels across the entire surface. If your partner tosses and turns, you feel it. Bonnell coils also tend to respond as a unit rather than individually, which means they conform less precisely to your body shape.
You'll find Bonnell coils in entry-level mattresses, guest room units, and some institutional contexts. They're not bad, they just have real limitations for couples or anyone who sleeps on their side.
Offset Coils
Offset coils are a refinement of the Bonnell design. The top and bottom of each coil are squared off (offset) rather than round, which creates a hinge-like action as the coil compresses. This allows more precise contouring to the body.
They're still connected by helical wires, so motion transfer is better than Bonnell but not eliminated. Offset coils are a solid mid-range choice and tend to be quite durable because the squared configuration distributes compression stress more evenly across the steel.
Continuous Wire (LFK) Coils
Continuous wire systems, sometimes called LFK (Lura-Flex) coils, are formed from a single strand of wire that runs the entire length of the mattress in a series of loops. Each column of coils is connected within itself.
The result is a firm, consistent feel across the surface. Continuous wire mattresses tend to be quite durable and are less prone to individual coil failure because there are no separate coil units to break down independently. The tradeoff is that they feel fairly uniform, good for stomach sleepers or anyone who prefers a firm, supportive surface, less ideal for side sleepers who need pressure relief at the shoulders and hips.
Individually Wrapped (Pocketed) Coils
Individually wrapped coils, also called pocketed coils or Marshall coils, are each encased in their own fabric pocket. They operate independently of one another.
This is the system that most quality mattresses use today, and for good reason. Because each coil moves on its own, the mattress can conform to the body's curves more precisely. Pressure relief improves. Motion transfer drops significantly, which matters enormously for couples. Pocketed coil systems also allow manufacturers to create zones, areas of the mattress with different coil gauges to provide firmer support at the lumbar region and softer response at the shoulders.
Brad, Owner, 40+ years of experience: "The single biggest improvement in spring mattress technology over the last twenty years has been the pocketed coil. When we compare them side by side in the showroom, most customers immediately feel the difference, they press down in one spot and the area beside it doesn't move. That's what you want when you're sharing a bed."
Our Restonic ComfortCare line uses individually wrapped coils throughout. It's one of the primary reasons we recommend Restonic as our premium option, the coil system is genuinely well-engineered.
Coil Count: What It Actually Means
Coil count is the number most commonly cited in mattress marketing, and it's the number most often misunderstood.
Here's what coil count actually tells you: how many individual coil units are in the mattress. A queen mattress with 800 coils has more coils than one with 600. That's it. The number alone says nothing about quality, durability, or comfort.
Why Count Doesn't Tell the Whole Story
A mattress with 2,000 thin, cheaply gauged coils can perform worse than one with 800 properly tempered, heavy-gauge coils. Manufacturers sometimes inflate coil counts by using micro-coils in comfort layers, tiny coils stacked on top of the support coils. These get included in the total count even though they serve a different function from the primary support system.
What matters more than the count is the count relative to the coil type and the mattress size. A queen with 1,000 pocketed coils is meaningful. A queen with 1,000 Bonnell coils is less impressive because the Bonnell system uses thicker wire and doesn't need as high a density to provide support.
What's a Reasonable Count for a Queen?
Coil Count Benchmarks by Size (Pocketed Coil Systems)
- Twin: 600-800 coils is a reasonable range for a quality pocketed system
- Double/Full: 800-1,000 coils
- Queen: 1,000-1,300 coils for a well-constructed unit
- King: 1,200-1,800 coils (wider surface, proportionally more coils)
Below these ranges for a pocketed system, the coils may be spaced too far apart to provide consistent support. Well above these ranges without a corresponding price increase, be cautious, you may be looking at micro-coils being counted.
Our Restonic ComfortCare Queen has 1,222 individually wrapped coils. That puts it solidly in the quality range for a queen-size pocketed coil mattress. The king version steps up to 1,440 coils, which is proportional and appropriate for the larger surface area.
When a salesperson leads with coil count as the primary selling point, that's worth noting. The better question to ask is: what type of coil, what gauge, and how are they arranged?
Steel Gauge and Why It Changes Everything
Steel gauge is the measurement of the wire thickness used to form the coils. Here's where it gets counterintuitive: in wire gauge, a lower number means thicker wire. A 12-gauge coil is thicker and firmer than a 15-gauge coil.
Common Gauge Ranges and What They Mean
| Wire Gauge | Thickness | Feel | Best For |
|---|---|---|---|
| 12-12.5 gauge | Thickest | Very firm | Heavier individuals, stomach sleepers |
| 13-14 gauge | Medium-thick | Firm to medium | Back sleepers, combination sleepers |
| 15-16 gauge | Thinner | Medium to soft | Side sleepers, lighter individuals |
Many quality mattresses use a zoned gauge approach, firmer-gauge coils in the lumbar zone, lighter gauge at the shoulders and legs. This creates a support profile that aligns with the natural curve of the spine rather than treating the entire body as one uniform load.
Tempered vs. Untempered Steel
Tempering is a heat treatment process that strengthens the steel and gives it memory, the ability to return to its original shape after compression. Tempered coils last significantly longer than untempered ones. After years of nightly use, untempered coils develop a set (a permanent compression) that shows up as a visible sag in the mattress surface.
Good mattress brands specify tempered steel in their coil systems. If a product sheet doesn't mention tempering and the price is very low, that's a question worth asking before you buy.
What Research Says About Support and Spinal Alignment
A 2008 study in the Journal of Chiropractic Medicine by Jacobson and colleagues found that medium-firm mattresses produced the best outcomes for sleep quality and spinal alignment across a range of body types. Coil systems that allow zoned support, firmer under the hips and lumbar, softer at the shoulders, can achieve this profile. The finding supports the case for individually wrapped zoned coil systems over one-firmness-fits-all designs.
Why Coil Mattresses Win for Hot Sleepers
If you wake up sweating, or if your partner complains that you radiate heat all night, a coil spring mattress is worth serious consideration.
The core of a coil mattress is mostly air. Steel coils with space between them allow convective airflow through the mattress, heat generated by your body rises through the sleep surface and disperses rather than building up under you. This is a physical property of the construction. It doesn't degrade over time. It doesn't require special gel layers or copper infusions. It's just how steel coil systems work.
How This Compares to Memory Foam
Memory foam is a dense, closed-cell material. It conforms to your body by responding to heat and pressure, which means it holds heat close to the sleep surface. Early memory foam mattresses had a significant heat-trapping problem. Manufacturers have worked hard to mitigate this with gel infusions, open-cell foam formulations, and ventilation channels, and these solutions have improved things substantially.
But none of them are as naturally cool as a coil system. The airflow through a spring core is passive and continuous. A foam mattress, no matter how well-engineered, is working against its own material properties to stay cool.
For hot sleepers in Brantford, where summer humidity can make sleeping uncomfortable, a coil spring mattress with a breathable cover is often the most reliable long-term solution.
Temperature and Sleep Quality
Research by Okamoto-Mizuno and Mizuno (2012) in the Journal of Physiological Anthropology established that thermal comfort during sleep significantly affects sleep architecture, including the proportion of slow-wave and REM sleep. Core body temperature naturally drops as we fall asleep. Materials that trap heat interfere with this thermoregulatory process. Coil systems, by allowing passive airflow, support rather than resist this natural cooling.
The Comfort Layer Still Matters
A coil mattress is not just coils. The comfort layers on top, foam, wool, latex, or fibre, also affect temperature. A coil base with a thick, dense memory foam comfort layer can still sleep warm. If heat retention is a priority concern, look for coil mattresses with natural comfort layers like wool or cotton, or a thinner foam layer over the coil system.
The Restonic Luxury Silk and Wool line pairs a pocketed coil base with natural fibre comfort layers specifically for this reason. It's worth knowing those options exist.
Coil Support for Heavier Individuals
Body weight has a direct bearing on which mattress construction will serve a person well. For individuals over roughly 100 kg (220 lbs), the support characteristics of a coil spring mattress offer real advantages over foam-only alternatives.
Why Foam Can Struggle Under Higher Weight
Foam mattresses, particularly those with soft or medium comfort layers, can bottom out under heavier individuals. Bottoming out happens when the foam compresses beyond its designed range and the sleeper effectively sinks through to a less supportive layer beneath. It doesn't always happen immediately, it can develop gradually over months as the foam loses its resiliency.
Coil systems, by contrast, provide progressive resistance. As more weight is applied, the coils push back with increasing force. This is a mechanical property that doesn't deteriorate in the same way foam does. A properly gauged coil system will support a heavier sleeper consistently over the mattress's full lifespan.
What to Look For at Higher Weight Ranges
Coil Specs That Matter for Heavier Sleepers
- Gauge 12.5-14: Thicker wire provides more resistance per coil, which translates to better support under sustained weight
- Higher coil count: More coils means the weight is distributed across more contact points, reducing the load on any single coil
- Tempered steel: Essential, untempered coils under high load will develop a permanent set much faster
- Reinforced edge support: A coil mattress should have a perimeter support system so the edge doesn't compress when sitting on the side of the bed
- Thinner comfort layer: Heavier individuals often sleep better on a mattress where the comfort layer is substantial enough for cushioning but thin enough that they don't sink past it
Dorothy, Sleep Specialist: "We get a lot of customers who've been on an all-foam mattress for a few years and notice it's developed an impression where they sleep. Sometimes that's just the comfort layer conforming, which is normal. But sometimes it's the foam losing structural integrity from sustained weight. A coil base doesn't have that problem in the same way. The steel is still the steel."
If you're a heavier individual and you've had a foam mattress that developed a visible sag within the first five years, a coil system is worth trying. We can walk you through the options at our showroom on West Street in Brantford, Brad has fitted customers across a wide range of body types and is straightforward about what will and won't hold up.
Spring vs. Memory Foam: An Honest Comparison
This is the question we hear most often, and it deserves a real answer rather than a sales pitch.
Memory foam and coil spring mattresses are genuinely different products that suit different sleepers. Neither is objectively better. The right choice depends on your sleep position, body type, heat sensitivity, and whether you share a bed.
| Factor | Coil Spring | Memory Foam |
|---|---|---|
| Airflow / Temperature | Naturally cooler | Retains more heat (improved with gel/open-cell, but not equal) |
| Motion Transfer | Better with pocketed coils; worse with Bonnell | Generally excellent, foam absorbs motion well |
| Edge Support | Better, especially with perimeter coil systems | Softer at edges in most configurations |
| Responsiveness | Bouncy, easier to move around on | Slow to respond, some people feel "stuck" |
| Pressure Relief | Good with pocketed coils; less precise with Bonnell | Excellent, conforms closely to body curves |
| Durability | Steel coil base is very durable | Varies significantly by foam density and quality |
| Heavier Sleepers | Generally better long-term support | Can bottom out or develop impressions faster |
| Typical Lifespan | 8-12 years with quality construction | 6-10 years depending on density |
Who Should Consider a Coil Spring Mattress
A coil spring mattress is probably a better fit if you run hot at night, weigh more than 100 kg, prefer a responsive surface that's easy to move on, or if you've had foam mattresses develop visible sags within a few years. It's also the better default if you're not sure, the comfort range is broader and more adjustable through comfort layer selection.
Who Might Prefer Memory Foam
If you're a side sleeper with significant shoulder or hip pain, a high-quality memory foam mattress can offer pressure relief that a coil system at the same price point can't quite match. Memory foam also handles motion transfer very well, which matters if you or your partner is a light sleeper and one of you moves frequently at night.
Many of the best hybrid mattresses combine both systems, a pocketed coil support core with a memory foam or latex comfort layer on top. This is often the practical best-of-both-worlds solution, and it's worth exploring if you're torn between the two.
What Brantford Customers Tell Us
In our experience at the West Street showroom, heat retention is a more common concern than people expect before they come in. Brantford summers have their humidity, and we're in a region where older homes often don't have air conditioning in every room. Customers who've been sleeping hot on a foam mattress frequently find that switching to a coil system with a breathable cover resolves the issue without any other changes. It's one of those things that's hard to predict until you try it.
Real Specs: Restonic at Mattress Miracle
We carry Restonic as our premium mattress line, and we're transparent about why. The coil engineering is genuinely sound, the warranty is reliable, and the price-to-quality ratio holds up to comparison with anything you'd find online or at a big box retailer.
Here are the actual specifications for the coil-based Restonic models we carry at our Brantford showroom:
| Model | Size | Price | Coils | Notes |
|---|---|---|---|---|
| ComfortCare | Twin | 690 | Entry point, individually wrapped | |
| ComfortCare | Double | 980 | Good for kids/teens rooms | |
| ComfortCare | Queen | $1,619 | 1,222 | Best value, most recommended |
| ComfortCare | King | $2,051 | 1,440 | Highest coil count in the line |
| Revive Reflections ET | Queen | $1,395 | 1,200 | Flippable dual-sided design |
| Luxury Silk & Wool | Queen | $1,395 | 884 zoned | Natural fibres, temperature regulation |
| Revive Tiffany Rose / Jasmine | Queen | $1,995 | 1,188 | Talalay Copper Latex comfort layer |
| Revive St. Charles / Elizabeth | Queen | $2,150 | 1,188 | 15" flagship height |
The ComfortCare Queen at 1,222 individually wrapped coils for $1,619 is the one we recommend most often to customers who want a well-built coil spring mattress without overextending their budget. It's not the flashiest product we carry, but it consistently earns positive feedback from the people who buy it.
For customers who want natural fibre comfort layers combined with coil support, the Luxury Silk and Wool model is worth a look. The zoned coil arrangement, 884 strategically placed coils rather than a uniform grid, is designed to match the natural load distribution of the body rather than just maximising a count figure. It's a different philosophy, and it works.
A Note on Flippable Mattresses
If longevity is a primary concern, consider the Restonic Revive Reflections ET, a dual-sided flippable mattress. Rotating and flipping a coil mattress every six months distributes wear evenly across the coil system and can significantly extend the mattress's useful life. Single-sided mattresses are designed to be rotated but not flipped. If the manufacturer specifies flippable, take advantage of it.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
How long does a coil spring mattress last?
A well-constructed coil spring mattress with tempered steel coils typically lasts 8 to 12 years with proper care. Key factors are the quality of the steel, whether the mattress has been regularly rotated, and the weight load it's been supporting. Cheaper coil mattresses with untempered wire may show significant sagging within three to five years. A mattress from a reputable brand like Restonic, used as directed and rotated regularly, should reach the high end of that range.
Is a higher coil count always better?
No. Coil count is one factor among several, and it's frequently the most misrepresented. A mattress with 2,000 micro-coils stacked in the comfort layer may count those in its total, giving an inflated figure that doesn't reflect the primary support system's quality. More relevant questions are: what type of coil, what steel gauge, and is the steel tempered? For a queen with pocketed coils, 1,000 to 1,300 is a genuinely good range, above that, diminishing returns set in quickly.
Can I use a coil spring mattress on an adjustable base?
Some coil mattresses are compatible with adjustable bases and some are not. Standard interconnected Bonnell and continuous wire systems generally cannot flex with an adjustable base without damage to the coil structure. Many pocketed coil mattresses, however, are designed to flex. Check the manufacturer's specifications before pairing any coil mattress with an adjustable frame. We carry adjustable bases at Mattress Miracle and can advise on compatible coil options if you're interested in both.
Do coil spring mattresses need a box spring?
Not necessarily, but they do need a solid, supportive foundation. A box spring is one option. A slatted platform bed with slats no more than 7 cm (about 3 inches) apart works well. A solid platform also works. What a coil mattress should not sit on is a base with widely spaced slats or a slatted frame that allows the mattress to bow between slats, which puts uneven stress on the coil system over time. If you're unsure about your current frame, ask us, we can tell you quickly whether it's appropriate.
Where can I try a coil spring mattress in Brantford?
Mattress Miracle at 441½ West Street in Brantford carries a selection of Restonic coil spring mattresses in-store, including the ComfortCare line with individually wrapped coils. You can try them in person, ask questions without pressure, and get honest guidance from a team that's been working with these products since 1997. Call (519) 770-0001 or stop in during store hours.
Sources
- Jacobson, B.H., Gemmell, H.A., Hayes, B.M., & Altena, T.S. (2008). Effectiveness of a selected bedding system on quality of sleep, low back pain, shoulder pain, and spine stiffness. Journal of Manipulative and Physiological Therapeutics, 25(2), 88-92. doi.org/10.1067/mmt.2002.121958
- Okamoto-Mizuno, K., & Mizuno, K. (2012). Effects of thermal environment on sleep and circadian rhythm. Journal of Physiological Anthropology, 31(1), 14. doi.org/10.1186/1880-6805-31-14
- Jacobson, B.H., Boolani, A., & Smith, D.B. (2009). Changes in back pain, sleep quality, and perceived stress after introduction of new bedding systems. Journal of Chiropractic Medicine, 8(1), 1-8. doi.org/10.1016/j.jcm.2008.09.001
- Defloor, T. (2000). The effect of position and mattress on interface pressure. Applied Nursing Research, 13(1), 2-11. doi.org/10.1016/S0897-1897(00)80013-0
- Verhaert, V., Haex, B., De Wilde, T., Berckmans, D., Verbraecken, J., de Valck, E., & Vander Sloten, J. (2011). Ergonomics in bed design: the effect of spinal alignment on sleep parameters. Ergonomics, 54(2), 169-178. doi.org/10.1080/00140139.2010.538723
- Krauchi, K. (2007). The human sleep-wake cycle reconsidered from a thermoregulatory point of view. Physiology & Behavior, 90(2-3), 236-245. doi.org/10.1016/j.physbeh.2006.09.007
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle, 441½ West Street, Brantford, ON, (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.
If you'd like to feel the difference between coil types in person, come in and we'll walk you through the options. Brad or Talia can pull back the cover on a few models and show you exactly what's inside, no guessing required.
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