Quick Answer: On the standard 1 to 10 firmness scale, most Canadians sleep best between 5 and 7 (medium to medium-firm). Back sleepers and heavier builds generally need firmer support (6 to 8). Side sleepers typically do better at medium (4 to 6) for shoulder and hip pressure relief. Stomach sleepers need the firmest mattress to prevent lumbar hyperextension. Children and teens need medium-firm to firm, not soft. The Restonic ComfortCare (queen, $1,619, 1,222 pocketed coils) sits at medium-firm and is our most versatile recommendation for the majority of Canadian sleepers.
In This Guide
- The Mattress Firmness Scale: What the Numbers Mean
- Firmness by Sleep Position
- Firmness by Body Weight
- Tween and Teen Mattress Firmness in Ontario
- Renter Mattress Guide: Portability and Budget
- How to Trial Firmness in a Showroom
- Restonic Firmness Options at Mattress Miracle
- Frequently Asked Questions
- Visit Our Brantford Showroom
Reading Time: 9 minutes
Mattress firmness is the single most subjective dimension of mattress shopping and the most commonly misunderstood. Firmness is not the same as support. A soft mattress can provide good spinal support if the construction is right. A firm mattress can feel comfortable if the comfort layer is appropriate for your sleep position. This guide separates the firmness scale from the construction quality question and helps Canadian buyers identify where on the scale they actually belong.
The Mattress Firmness Scale: What the Numbers Mean
The industry standard is a 1 to 10 scale where 1 is the softest possible and 10 is the firmest. In practice, mattresses sold at consumer retail in Canada fall between 3 and 8. You will not find a 1 (essentially a pile of foam) or a 10 (a plank of solid foam) in a standard mattress showroom.
| Scale | Label | Description |
|---|---|---|
| 1-2 | Ultra soft | Rare in consumer retail. Significant sink-through. |
| 3-4 | Soft to medium-soft | Common for side sleepers. More contouring, less pushback. |
| 5-6 | Medium | Most common for general use. Balances contouring and support. |
| 6-7 | Medium-firm | Good for back sleepers and heavier builds. Restonic ComfortCare range. |
| 7-8 | Firm | Stomach sleepers and people who prefer sleeping "on top of" the mattress. |
| 9-10 | Extra firm | Rare in consumer retail. Medical rehabilitation contexts. |
Two important caveats: firmness is perceived differently at different body weights (a medium mattress feels firmer to a lighter person), and comfort layer material affects perceived firmness independently of the underlying support construction. A pocketed coil base with a soft latex comfort layer feels different from the same firmness level achieved with memory foam.
Firmness by Sleep Position
Back sleepers: Need enough firmness to prevent the hips from sinking below the shoulders, which would create a bent spine alignment. Medium-firm (6 to 7) is the most common recommendation. The lumbar region needs consistent support throughout the night.
Side sleepers: Need pressure relief at the shoulder and hip contact points, which requires more sink-through than back sleeping. Medium to medium-soft (4 to 6) allows the shoulder to compress into the comfort layer without the spine bending at the hip. The wrong choice for side sleepers is a very firm mattress, which creates pressure point pain at the shoulder and hip.
Stomach sleepers: Sleeping face down requires the hips not to sink below the spine plane, which would hyperextend the lumbar region. Firm (7 to 8) prevents this sinkage. Stomach sleeping is the position for which firmness matters most acutely from a spinal health perspective. The Canadian Chiropractic Association notes that stomach sleeping creates the most cervical spine stress of the common positions and recommends transitioning to side sleeping where possible.[1]
Combination sleepers: People who regularly change positions during the night benefit from medium-firm (6 to 7) as a compromise. Pocketed coil construction helps with position changes because the mattress responds quickly to movement rather than holding you in a compressed position the way memory foam does.
Firmness by Body Weight
Body weight changes how a mattress firmness feels in practice:
Under 130 lbs (59 kg): Lighter sleepers compress mattresses less. A mattress rated medium-firm may feel firm. Lighter builds often benefit from shifting one step softer than the standard recommendation for their sleep position.
130 to 230 lbs (59 to 104 kg): The range for which most standard firmness ratings apply. Medium to medium-firm for most positions.
Over 230 lbs (104 kg): Heavier builds compress mattresses more deeply. A mattress rated medium may feel softer than expected. Heavier builds often benefit from firmer ratings and need higher coil counts to maintain support across a wider compressed area. The Restonic ComfortCare king (1,440 coils) is our recommendation for heavier couples; the higher coil count maintains even support under increased load.
Firmness and Spinal Alignment Research
A landmark randomised controlled trial by Kovacs et al. published in The Lancet in 2003 compared firm and medium-firm mattresses for chronic low back pain outcomes. Medium-firm mattresses were associated with less pain and better sleep quality than firm mattresses over a 90-day period. A systematic review in Sleep Health by Radwan et al. (2015) confirmed that medium-firm mattresses most consistently produced optimal spinal alignment and reduced pain scores across multiple populations. This research does not mean firm mattresses are always wrong. It means that "the firmer the better" for back pain is not supported by evidence.[1][2]
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Tween and Teen Mattress Firmness in Ontario
Tweens (ages 8 to 12) and teenagers have specific firmness needs that differ from adults. Adolescents are still in skeletal development. A mattress that is too soft during growth years may not provide adequate support for developing spinal structures.
The Canadian Paediatric Society recommends firm sleeping surfaces for young children, with the emphasis shifting toward medium-firm as children grow into adolescence. For tweens and teens, medium-firm (5 to 7) is the appropriate range. Pillow-top and plush mattresses marketed to teenagers for their "comfortable" feel often fall at 3 to 4 on the firmness scale, which is softer than appropriate for growing spines.
Ontario parents often ask at our showroom whether a teen needs a different mattress from what an adult would use. The answer is: not in construction type, but in firmness. A twin Restonic ComfortCare at medium-firm is an appropriate teen mattress. The same coil construction in the double or queen size works for adults.
Renter Mattress Guide: Portability and Budget
Renters in Ontario have specific mattress buying considerations that differ from homeowners:
Portability: A mattress that may be moved across the city or to a new province within 2 to 3 years should be durable enough to handle moving company handling (pocketed coil construction survives moves better than all-foam), and ideally compressed-and-bagged for transport if moving to a smaller space. Not all quality mattresses are compressible; confirm with the retailer before buying.
Lease length matching: If you plan to stay in a rental for 1 to 2 years, a lower price point may make sense. If you are in a longer-term rental and planning to take the mattress with you when you buy, a 10-year mattress investment is the better value regardless of renter status.
Foundation situation: Many rental apartments have bed frames without a box spring or platform base. Confirm your rental's bed frame type before choosing a mattress. Pocketed coil mattresses require a flat, even base with slat spacing under 3 inches. A cheap all-foam rollout works on most surfaces but provides less support long-term.
How to Trial Firmness in a Showroom
Most Canadians spend less than 5 minutes lying on a mattress before purchasing. Research on mattress purchase satisfaction consistently shows this is inadequate. The minimum recommended showroom trial is 10 to 15 minutes per mattress in your primary sleep position.
Practical showroom firmness testing:
Lie in your primary sleep position: Not on your back if you primarily sleep on your side. Test in the position you actually use most.
Check lumbar contact: For back sleepers, there should be no gap between your lumbar curve and the mattress surface. If you can slide your hand freely under your lower back, the mattress is too firm for you.
Check shoulder pressure: For side sleepers, your shoulder should be able to sink into the comfort layer without creating a hard pressure point. If the shoulder contact feels like pressing against a firm surface rather than sinking in slightly, the mattress is too firm.
Check hip alignment: Lying on your side, your hips should be level or very slightly lower than your shoulder line. If your hips are significantly higher than your shoulder (hips not sinking enough), the mattress is too firm for side sleeping.
Dorothy, Sleep Specialist: "The question I always ask is: what are you sleeping on now, and do you wake up with pain or just discomfort? Pain usually points to a firmness problem. Discomfort from temperature or motion disturbance points to other issues. If someone tells me their current medium-firm mattress causes hip pain when they sleep on their side, I move them to a medium and watch what happens when they lie down. The answer is usually obvious within 5 minutes."
Restonic Firmness Options at Mattress Miracle
| Model | Approx. Firmness | Queen Price | Best For |
|---|---|---|---|
| Restonic ComfortCare | Medium-firm (6-7) | $1,619 | Back sleepers, most builds, versatile |
| Restonic Revive Reflections ET | Dual-sided (flip for different firmness) | $1,395 | Couples with different preferences, adjustable over time |
| Restonic Luxury Silk and Wool | Medium (5-6) | $1,395 | Side sleepers, natural materials preference |
| Restonic Revive Tiffany Rose/Jasmine | Medium (5-6) | $1,995 | Side sleepers, hot sleepers, couples |
| Restonic Revive St Charles/Elizabeth | Medium-firm (6-7) | $2,150 | Back sleepers, heavier builds, flagship quality |
The Restonic Revive Reflections ET is worth noting for couples who cannot agree on firmness. As a dual-sided flippable mattress, it allows one firmness setting to be tested, and if it does not work, the mattress can be flipped to try the other side without returning the product.
Finding the right firmness level in Canada requires testing mattresses in person, because firmness ratings are not standardized across manufacturers. Mattress Miracle at 441½ West Street in Brantford carries mattresses across the full firmness spectrum from plush to extra firm. Dorothy recommends lying on at least three different firmness levels during a showroom visit to calibrate your personal preference. What feels "medium" from one brand may feel "firm" from another. Call (519) 770-0001 for a guided firmness comparison.
Shop: Firm Mattresses at Mattress Miracle
Shop This Topic at Mattress Miracle
Here are the firm mattresses we carry at Mattress Miracle:
- Sentora Ultra Firm Mattress
- Spinal Rest Firm Mattress
- Sydney TT Firm Euro Top Mattress
- High Density Firm Mattress
Or firm mattresses in our Brantford showroom.
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 do I know if my mattress is too soft or too firm?
Signs your mattress is too soft: you wake with lower back pain as a back sleeper, you feel like you are "sinking in" and cannot change positions easily, your hips are lower than your shoulders when lying on your side. Signs it is too firm: you wake with hip or shoulder pain as a side sleeper, you feel pressure points at the shoulder or hip, you wake with numbness in arms or legs from reduced circulation at pressure points.
What firmness should a teenager use?
Medium-firm (5 to 7 on the standard scale) is appropriate for teenagers. Soft or pillow-top mattresses that register 3 to 4 on the firmness scale are too soft for developing spines. The Canadian Paediatric Society recommends firm sleeping surfaces for children, with medium-firm being appropriate as adolescents mature. A twin Restonic ComfortCare at medium-firm is our standard recommendation for teen bedrooms.
Can a soft mattress cause back pain?
Yes, for back and stomach sleepers. If the mattress is soft enough to allow the hips to sink significantly lower than the shoulders in a back sleeping position, the lumbar spine flexes into an unnatural curve and the muscles compensate overnight. This produces the classic "woke up with a sore back" experience. For side sleepers, a very soft mattress can allow the shoulders and hips to sink so deeply that the spine curves laterally, which also causes back pain.
What is the best firmness for renters who move frequently?
Medium-firm is the most versatile choice for renters who may move to different apartments with different bed frames and room configurations. It works across sleep positions without being at an extreme of the scale, and pocketed coil construction at medium-firm survives moves better than soft foam alternatives. The Restonic ComfortCare at medium-firm, available from our Brantford showroom with delivery across Ontario, is our recommendation for this situation.
Sources
- Kovacs FM, et al. "Effect of firmness of mattress on chronic non-specific low-back pain: randomised, double-blind, controlled, multicentre trial." The Lancet. 2003;362(9396):1599-1604. doi:10.1016/S0140-6736(03)14792-7.
- Radwan A, et al. "Effect of different mattress designs on promoting sleep quality, pain reduction, and spinal alignment in adults with or without back pain: systematic review of controlled trials." Sleep Health. 2015;1(4):257-267. doi:10.1016/j.sleh.2015.08.001.
- Canadian Chiropractic Association (CCA). "Back Pain and Sleep Position." chiropractic.ca. Guidance on sleep position and spinal health, including stomach sleeping risks.
Related Reading
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 are not sure whether you need softer or firmer, come in and we will walk you through the Restonic range in your sleep position. Dorothy is available during showroom hours to help diagnose firmness-related sleep issues with the same practical approach she uses with every customer.