Foam Density Demystified: Why Rejuvenate Feels Different at the Same ‘Firmness’

If you’ve ever tried two “medium-firm” mattresses and wondered how one feels buoyant and supportive while the other feels marshmallow-soft (or like a plank), you’ve already discovered the secret topic of this foam density mattress guide Canada: density matters just as much as firmness – sometimes more. Haven’s LUX Rejuvenate is a perfect example. On paper, it may share a similar firmness rating with other all-foam beds, but on your body it feels very different: springier, cooler, and more supportive over time. That’s not marketing magic – it’s foam density and smart layering at work.

Foam Density 101: What It Actually Means

Foam density is a measurement of how much material is packed into a specific volume of foam, usually expressed in pounds per cubic foot (PCF).

• Higher density = more material in the same space

• Lower density = more air, less material

Density is not the same as firmness. Instead, density tells you about:

• Durability – how long the foam resists sagging and body impressions

• Support – how well it holds your weight over years, not just the first month

• Pressure relief longevity – how long that “ahh” feeling lasts before it flattens out

Typical density ranges for mattress foams:

• Polyfoam (support + transition layers)

  • Low: < 1.5 PCF

  • Medium: 1.5–1.7 PCF

  • High: > 1.7 PCF

• Memory foam (slow-moving, “huggy” foams)

  • Low: < 4 PCF

  • Medium: 4–5 PCF

  • High: > 5 PCF

• Latex foam (like the Talalay in Rejuvenate)

  • Low: < 4.3 PCF

  • Medium: 4.3–5.3 PCF

  • High: > 5.3 PCF

In Canada, where many shoppers are looking for a mattress that handles cold winters, warm summers, and years of daily use, density is one of the best signals of long-term value.

Firmness vs Density vs ILD: Why “Medium” Isn’t Universal

When brands talk about softness or hardness, they’re usually referring to firmness – how the mattress feels when you first lie down.

Behind the scenes, engineers often use a measurement called ILD (Indentation Load Deflection) – the amount of force needed to compress foam to a certain percentage of its thickness. Higher ILD = firmer feel.

Here’s the catch:

• Firmness (or ILD) = how hard/soft it feels at the surface

• Density = how much material is in the foam and how long it keeps that feel

So two mattresses can both be labelled “Medium-Firm (6–7/10)” but be built with very different densities:

• One uses low-density comfort foams on top of a medium-density core → comfy at first, but more prone to early sagging.

• The other (like Rejuvenate) uses dense support foams plus resilient Talalay latex on top → feels slightly buoyant, resists body impressions, and maintains support over the long haul.

From a Canadian shopper’s perspective, this is where a “foam density mattress guide Canada” really pays off: once you know the difference, you can read spec sheets and instantly tell which “medium” will still feel medium in 5–10 years.

Why the LUX Rejuvenate Feels Different at the Same Firmness

On paper, the LUX Rejuvenate is an all-foam mattress available in medium-plush and medium-firm feels. In reality, it behaves more like an athletic recovery tool than a basic foam bed. That’s thanks to a very specific stacking of different foam densities and materials.

Key layers (simplified):

1. Natural Talalay latex comfort layer

   • Medium–high density latex with a naturally open-cell structure

   • Gives a buoyant, responsive feel instead of a slow, stuck-in-the-mud memory-foam hug

   • Helps with pressure relief at shoulders and hips without letting you bottom out

2. Transition and specialty foams (including cool-gel / bio foams)

   • Medium to higher-density foams that even out pressure and resist deep impressions

   • Help distribute weight, especially for Canadian sleepers who change positions through the night

3. High-density foam core

   • A dense support base that acts like the “chassis” of the mattress

   • Keeps your spine aligned and resists sagging, even under heavier sleepers

The result?

• Compared to many “medium-firm” memory-foam beds, Rejuvenate feels:

  • More lifted (you sleep on it, not in it)

  • More temperature stable (thanks to Talalay latex and ventilation)

  • More consistent across seasons, which matters in Canadian climates where bedroom temperatures can swing a lot over the year

Same Firmness, Different Feel: What’s Really Changing?

When two medium-firm mattresses feel totally different, it’s usually because of some combination of:

1. Comfort layer material

   • Talalay latex (like Rejuvenate) = springy, breathable, quick response

   • Memory foam = slow-moving, deep contour, often warmer

   • Simple polyfoam = lighter, less durable, can feel “flat” sooner

2. Foam density in each layer

   • Higher-density comfort foams keep their feel longer

   • Lower-density foams may feel soft and cosy at first, then develop ruts faster

3. Support core density

   • High-density polyfoam cores (1.8+ PCF) are linked with better durability and long-term support, versus cheaper low-density cores.

4. Zoning and design

   • Rejuvenate’s Advanced Pressure Relief (APR) version uses a zoned construction with a slightly softer midsection to cradle shoulders and hips, while keeping lumbar support more robust for side sleepers.Your body + sleep style

   • Lighter sleepers may barely activate deeper layers

   • Heavier or very active sleepers will notice the quality of the transition and base foams much more over time

So even if a spec sheet says “Medium-Firm (6–7/10)”, paying attention to density + materials explains why Rejuvenate has that signature “supportive but not squishy” feel that many Canadian hot-sleepers and athletes gravitate toward.

A Canadian Foam Density Checklist (So You Don’t Get Fooled by “Medium-Firm”)

When you’re researching online and aiming for the best foam density mattress guide Canada can offer, here’s a practical checklist to use on any brand – including ours:

1. Look for actual density numbers (PCF)

If a brand lists only “soft/medium/firm” but not density, that’s a red flag.

• Comfort layers:

  • Memory foam: aim for 4+ PCF for serious longevity

  • Latex: medium–high density (around 4.3–5.3+ PCF) is a good sweet spot

  • Support core:

  • Polyfoam core: look for “high-density” or “high-resiliency” polyfoam (≈1.8+ PCF) used in reputable Canadian designs.

2. Ask what type of foam is in the top 2–4 inches

Those top layers drive first impression comfort and heat management:

• Talalay latex: naturally breathable, responsive, and durable

• Gel / open-cell foams: help with temperature, but density still determines life span

• Cheap low-density foams: often found in budget beds, may feel great for 6–12 months then flatten

3. Check for certifications and eco story

For Canadian families, it’s worth confirming the foams are:

• CertiPUR-US® certified (low VOCs, no nasty chemicals)

• Ideally paired with plant-based or eco-conscious components – like soy-based foams and bamboo covers, which are part of Haven’s ethos

4. Match density to your body + sleep style

• Under ~130 lb: you may not need ultra-dense foams, but you still benefit from a quality core

• 130–230 lb: medium–high density in comfort layers + high-density core is the sweet spot

• 230+ lb or chronic pain: higher-density support and/or a hybrid may be better, which is why some heavier sleepers are steered toward hybrids if Rejuvenate APR feels too plush.

Where the LUX Rejuvenate Fits in the Landscape

Zooming out, here’s how Rejuvenate stacks up in the Canadian market:

• All-foam, but not “spongy” – thanks to the Talalay latex top and denser supporting layers, it feels more elastic and lifted than many memory-foam-only beds.

• High-density support core – designed for long-term durability and spinal support

• Cooling-forward design – aerated latex, cool-gel foams, and breathable bamboo cover address a common downside of traditional all-foam mattresses (heat build-up).

• Canadian-made and climate aware – built with Canadian sleepers in mind and tested in our range of bedroom temperatures, not just a single lab environment.

So when you lie on a LUX Rejuvenate and think, “This feels firmer/more supportive than other ‘medium’ foam beds I’ve tried,” you’re not imagining it. The foam density profile and material choices are doing the heavy lifting.

Bringing It Home: How to Use Foam Density to Choose Your Next Mattress

If you remember nothing else from this foam density mattress guide Canada, remember these three points:

1. Firmness is just the surface story.
   Always ask, “What densities and materials are under that ‘medium’ label?”

2. Density = durability and long-term support.
   Especially in Canada, where we expect a mattress to last through years of winter hibernation and summer late-night hockey or cottage seasons, higher-quality densities matter.

3. Rejuvenate feels different for a reason.
   The mix of Talalay latex, specialty transition foams, and a high-density core is why Rejuvenate can share a firmness rating with other all-foam mattresses but deliver a completely different, more resilient feel over time.

If you’re comparing options and want to decode how another “medium-firm” mattress stacks up against Rejuvenate on density, materials, and real-world feel, you can always pull up the specs and use this guide as your cheat sheet.