Quick Answer: Memory foam mattresses use viscoelastic foam that softens with body heat and slowly conforms to your shape, offering excellent pressure relief and motion isolation. The main drawbacks are heat retention and the deep sinking feeling some sleepers dislike. They work best for side sleepers who want pressure relief at the hips and shoulders, but heavier sleepers and hot sleepers are often better served by a hybrid or latex alternative.
In This Guide
Reading Time: 9 minutes
What Is Memory Foam?
Memory foam was originally developed by NASA in the 1960s as a seat cushioning material for aircraft. It found its way into consumer mattresses in the early 1990s and has been the dominant mattress category in Canada and the US for the past two decades.
The technical name is viscoelastic polyurethane foam. "Viscoelastic" means it has both viscous (slow-flowing) and elastic (spring-back) properties. At room temperature it's firm, but it softens when it absorbs body heat and body weight, conforming closely to your shape. When you get up, it slowly returns to its original form, which is where the "memory" name comes from.
The Science Behind the Feel
Memory foam's pressure-relieving properties come from its open-cell structure, which allows the foam to redistribute weight across a larger surface area. A 2011 study in Applied Ergonomics found that viscoelastic foam mattresses reduced interface pressure at the hip and shoulder by 23–32% compared to standard polyurethane foam. This makes them effective for reducing pressure point discomfort, particularly for side sleepers. However, the same open-cell structure that enables contouring also traps body heat more readily than innerspring or latex alternatives, which has driven the development of gel-infused and copper-infused memory foam variants.
How Memory Foam Works
When you lie on a memory foam mattress, two things happen simultaneously. Your body heat softens the foam near your skin, and your body weight compresses it downward. The foam slowly deforms to match your exact contours, distributing pressure more evenly than a spring or flat foam surface would.
The rate at which this happens is described as "response time." Traditional memory foam has a slow response time, meaning it takes several seconds to recover its shape after compression. Newer formulations and open-cell structures have faster response times, but even these are slower than latex or innerspring.
Beneath the comfort layer of memory foam, most mattresses use a denser polyurethane base foam as the support core. The quality of this base foam matters considerably. A thin or low-density base compresses and loses shape faster, leading to the body impressions and sagging that are common complaints about cheaper memory foam mattresses.
Pros of Memory Foam
Pressure Relief
This is memory foam's genuine strength. The contouring effect reduces pressure at bony prominences: hips, shoulders, knees. For side sleepers especially, this can meaningfully reduce discomfort at pressure points that would otherwise build over a night of contact with a firmer surface.
Motion Isolation
Memory foam absorbs movement rather than transferring it across the surface. If you share a bed with a partner who moves around, memory foam is one of the best options for minimizing sleep disturbance. This is one area where it genuinely outperforms innerspring and hybrid alternatives.
Noise-Free
No springs means no squeaking or creaking. Memory foam is completely silent, which matters for some couples and for light sleepers who notice the noise of an aging innerspring.
Dust Mite Resistance
Memory foam's dense structure is less hospitable to dust mites than traditional innerspring mattresses. This makes it worth considering for allergy sufferers, though a good mattress protector is still recommended regardless of mattress type.
Cons of Memory Foam
Heat Retention
The single biggest complaint about memory foam is that it sleeps hot. The contouring effect reduces airflow around the body, and the foam itself absorbs and retains heat. Gel-infused and copper-infused variants help, but they don't fully eliminate the warmth compared to latex or innerspring alternatives. If you tend to sleep hot, this is worth taking seriously.
The "Sinking" Feeling
Some sleepers love the enveloping feel of deep memory foam. Others find it claustrophobic. The slow response means repositioning during the night requires more effort than on a bouncier surface. Combo sleepers and people who shift positions frequently often find memory foam more work than they'd like.
Off-Gassing
New memory foam mattresses typically have a chemical smell when first unpacked. This is called off-gassing and comes from volatile organic compounds (VOCs) released by the foam. It usually dissipates within a few days in a ventilated room. CertiPUR-US certified foams have restrictions on harmful VOC levels, which we'll cover in the certifications section below.
Durability Under Heavy Use
Lower-density memory foam (under 3 lb/ft³ in the comfort layer) tends to break down more quickly than latex or quality innerspring mattresses, particularly for heavier sleepers. Body impressions and permanent compression are more common complaints with entry-level memory foam than with comparable innerspring or latex options.
Edge Support
All-foam mattresses typically have weaker edge support than innerspring hybrids. The perimeter of the mattress can compress significantly when you sit on the edge, which reduces the effective sleeping surface and makes getting in and out of bed more difficult, particularly for older adults.
Brad, Owner since 1987: "We used to carry a full memory foam line. The motion isolation was excellent and customers liked the pressure relief. The main problems were heat and longevity under heavier use. We moved more toward hybrids and latex because they hold up better long-term. I tell customers: if you love the feel of memory foam but sleep hot or weigh more than 200 lbs, look at Talalay latex. Similar pressure relief, better breathability, more durable."
Types of Memory Foam
Not all memory foam is the same. There are a few distinct formulations worth knowing about:
| Type | How It Differs | Best For |
|---|---|---|
| Traditional memory foam | Standard viscoelastic foam; slow response, dense feel | Deep pressure relief, motion isolation; not for hot sleepers |
| Gel-infused memory foam | Gel beads or gel swirls mixed in; absorbs heat initially | Slightly cooler than traditional; still warmer than latex or innerspring |
| Copper-infused memory foam | Copper particles added; antimicrobial, conducts heat away | Better heat conductivity; some antimicrobial benefit |
| Open-cell memory foam | Engineered pore structure allows more airflow | Better breathability than traditional; faster response |
| Plant-based memory foam | Some petroleum replaced with plant oils; lower VOCs | More eco-friendly option; slightly faster response |
Density and ILD: What the Numbers Mean
Two specs matter most when evaluating memory foam quality:
Foam Density (lb/ft³)
Density measures how much foam is packed per cubic foot. Higher density means more material, which generally means better durability and support. For memory foam comfort layers, look for at least 3 lb/ft³. Premium memory foam runs 4–5 lb/ft³. Base support layers should be at least 1.8 lb/ft³ for acceptable longevity.
| Density | Category | Durability |
|---|---|---|
| Under 3 lb/ft³ | Low density | Breaks down in 2–4 years; avoid for heavier sleepers |
| 3–4 lb/ft³ | Medium density | Reasonable for average-weight sleepers; 5–8 year lifespan |
| 4–5 lb/ft³ | High density | Premium quality; 8–12 year lifespan |
ILD (Indentation Load Deflection)
ILD measures firmness: how many pounds of force it takes to compress the foam by 25%. Lower ILD = softer. Higher ILD = firmer.
- 8–12 ILD: Very soft (luxury plush)
- 13–17 ILD: Soft to medium-soft
- 18–22 ILD: Medium
- 23–28 ILD: Medium-firm
- 29+ ILD: Firm
A typical all-foam mattress has a softer comfort layer (8–15 ILD) over a firmer support base (30–40 ILD). The combination creates both pressure relief and structural support.
Who Should (and Shouldn't) Buy Memory Foam
Memory Foam Is a Good Fit If You:
- Sleep on your side and have pressure point issues at the hips or shoulders
- Share a bed and motion isolation is a priority
- Sleep cool naturally and don't overheat at night
- Are under 200 lbs and want deep contouring comfort
- Have allergies and want a less hospitable environment for dust mites
- Sleep in a fixed position through the night without much repositioning
Memory Foam Is Probably Not the Best Choice If You:
- Sleep hot or sweat at night
- Weigh over 200 lbs (durability and support concerns over time)
- Move around a lot and find the "stuck" feeling frustrating
- Are a stomach sleeper (memory foam's contouring lets hips sink)
- Have difficulty getting in and out of bed (edge support issues)
- Are sensitive to chemical smells and don't want to wait for off-gassing
Memory Foam vs Latex vs Hybrid
| Feature | Memory Foam | Latex | Innerspring / Hybrid |
|---|---|---|---|
| Pressure relief | Excellent | Very good | Good (depends on comfort layer) |
| Motion isolation | Excellent | Good | Fair |
| Temperature | Warm | Neutral to cool | Cool |
| Bounce / responsiveness | Low | High | High |
| Edge support | Poor to fair | Fair | Good to excellent |
| Durability (avg) | 5–8 years (medium density) | 10–15 years | 7–12 years |
| Heavy sleeper suitability | Fair to poor | Good | Very good |
| Price range (queen) | $400–$3,000+ | $1,200–$5,000+ | $700–$4,000+ |
What We Carry at Mattress Miracle
We're transparent about our inventory. At Mattress Miracle in Brantford, we carry Restonic and Sleep In mattresses. While we don't carry a standalone all-foam memory foam line, Restonic's comfort layers in several models incorporate memory foam or Talalay latex elements over their zoned coil systems.
The Restonic Revive Tiffany Rose and Jasmine ($1,995 queen) use Talalay copper latex, which provides similar pressure-relieving properties to memory foam but with better temperature regulation and bounce. Many customers who come in wanting memory foam end up preferring the Talalay latex feel once they try it side by side.
If you're specifically seeking a memory foam mattress, the bed-in-a-box market (Endy, Casper, Douglas, etc.) offers several options. We can give you honest assessments of those brands' trade-offs compared to what we carry, so you can make an informed comparison. See our bed-in-a-box guide for more detail.
Dorothy, Sleep Specialist: "When someone comes in saying they want memory foam, I ask them what they like about it. Usually it's the pressure relief or the motion isolation. Once I know that, I can show them options that deliver the same benefit without the heat issue. Talalay latex is usually the answer."
A Note from Brantford
We've been helping Brantford families find the right sleep surface since 1987. Memory foam became popular in the early 2000s and we sold plenty of it. Over time, we found that customers with back pain and hot sleepers consistently had better long-term outcomes with hybrid and latex options. That's not a knock on memory foam — it's excellent for the right person. It's just not the right fit for everyone, and we'd rather help you get it right the first time.
Frequently Asked Questions
How long does a memory foam mattress last?
A quality memory foam mattress with high-density foam (4+ lb/ft³) can last 8–12 years. Lower density foam (under 3 lb/ft³) often shows body impressions and softening within 3–5 years. Look at foam density specs, not just warranty length, when evaluating longevity. Using a mattress protector and rotating regularly extends the useful life.
Is memory foam good for back pain?
It depends on the type of back pain and sleep position. Memory foam can help side sleepers with pressure-point-related discomfort by reducing hip and shoulder pressure. However, for lower back pain caused by insufficient support, memory foam's deep contouring can sometimes allow the spine to flex in ways that worsen symptoms. A medium-firm to firm hybrid is often more reliably helpful for lower back pain across sleep positions.
Do memory foam mattresses sleep hot?
Traditional memory foam does sleep warmer than innerspring or latex. Gel-infused and copper-infused variants improve this somewhat, and open-cell constructions help with breathability. If you tend to overheat at night, a hybrid mattress (coil base with a thin foam or latex comfort layer) or a Talalay latex mattress will typically keep you cooler.
What is off-gassing and is it harmful?
Off-gassing is the release of VOCs (volatile organic compounds) from new foam. Most people notice a chemical smell when first unboxing a memory foam mattress, which typically dissipates in 24–72 hours in a ventilated room. CertiPUR-US certified foams are required to meet limits on harmful VOC emissions. The smell is generally not considered harmful at typical exposure levels, but sensitive individuals may want to air out the mattress for a few days before sleeping on it.
Can I flip a memory foam mattress?
No. Most memory foam mattresses are one-sided: the comfort layer is on top and the support base is on the bottom. Flipping them puts the support layer on top, which is uncomfortable and doesn't work correctly. You can and should rotate them head-to-foot every 3–6 months to even out wear. If you want a flippable mattress, look at Sleep In's Canadian-made double-sided mattresses, which we carry in our Brantford showroom.
Visit Our Brantford Showroom
Mattress Miracle
441 1/2 West Street, Brantford
Phone: (519) 770-0001
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
We're happy to walk you through the differences between memory foam, Talalay latex and hybrid options in person. Come try them back to back and find out which feel actually works for you, not just which one you've heard about online.
Related Reading
- Mattress Types Explained: Innerspring, Hybrid, Latex and More
- Bed-in-a-Box Mattresses: What to Know Before Buying in Canada
- Mattress Certifications Explained: CertiPUR-US, GOLS, GOTS and Off-Gassing
- Best Mattress for Back Pain, Sciatica and Fibromyalgia in Canada
- Best Cooling Mattress for Hot Sleepers in Canada
Sources
- Jacobson, B.H. et al. (2010). Effect of prescribed sleep surfaces on back pain and sleep quality. Applied Ergonomics, 42(1), 91-97.
- Verhaert, V. et al. (2011). Unobtrusive assessment of motor patterns during sleep based on mattress indentation measurements. IEEE Transactions on Information Technology in Biomedicine, 15(5), 787-794.
- Radwan, A. et al. (2015). Effect of different mattress designs on sleep quality and pain reduction. Sleep Health, 1(4), 257-267.
- CertiPUR-US. (2024). Foam certification standards and VOC limits. certipur.us
- Health Canada. (2023). Indoor air quality and volatile organic compounds. canada.ca
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available, wheelchair accessible. 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.