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Low Density Foam Mattresses – Guide to Benefits, Types, and Considerations



Introduction to Low Density Foam Mattresse

A low density foam mattress is made from polyurethane or memory foam that has a lower density and weight than standard foam. Low density foam is defined as foam that is 2-3 pounds per cubic foot. This makes it much lighter and more breathable than higher-density foam options.

Low density foam conforms very closely to the contours of your body to relieve pressure points. However, the tradeoff is that low density foam also tends to be less durable and supportive.

Benefits of low density foam mattresses:

  • Very conforming, hugging feel
  • Alleviates pressure points
  • More breathable, stays cooler
  • Less expensive
  • Lightweight and easy to move

Drawbacks of low density foam:

  • Won’t last as long
  • Prone to impressions
  • Less support for heavy people
  • Less durable than higher densities

Density Scale for Foam Mattresses

The density of a foam mattress refers to its weight per cubic foot, expressed in pounds. This measurement gives you an indication of how durable, supportive, and conforming a foam mattress will be.

Here is an overview of mattress foam densities:

  • Low density – 2 to 3 lb density
  • Medium density – 4 to 5 lb density
  • High density – 6+ lb density

Low density foam is much more affordable and lightweight. But it comes at the cost of durability and body support.

Higher density foam is more supportive and durable, but also more expensive and not as conforming.

Pros of a Low Density Foam Mattress

There are many benefits associated with choosing a mattress made from low density foam:

Exceptional Pressure Relief

  • Low density foam conforms very closely to the shape of your body. This helps alleviate tension at pressure points like the shoulders, hips, and back.
  • Provides cushioning and a “body hugging” feel. Great for side sleepers.

Cool and Breathable

  • The open cell structure of low density foam allows more airflow through the material.
  • It helps reduce heat retention compared to higher density options.
  • Stays cooler through the night.

Budget-Friendly Cost

  • Low density polyurethane and memory foam are quite affordable.
  • Costs significantly less than medium or high density foam.
  • It’s a great option when on a tight budget.

Easy to Move and Rotate

  • Weighs less than higher density foam mattresses.
  • Easy to rotate or flip your mattress. Helps extend its usable life.
  • Convenient for guest rooms or taking with you when moving.

Cons of Low Density Foam

However, there are also some potential drawbacks with low density foam mattresses:

Durability Issues

  • Low density foam is less resilient and more prone to permanent body impressions forming over time.
  • Tends to start sagging and lose support sooner than higher density foam.
  • May need to be replaced sooner if used every night.

Insufficient Body Support

  • Does not provide enough push-back support for stomach and back sleepers over 150 lbs.
  • Can feel like you’re sinking into the mattress too much without proper support.

More Susceptible to Damage

  • The soft, pliable nature of low density foam makes it easier to dent or damage.
  • Areas like the edges and corners tend to break down faster.

Best Uses for a Low Density Mattress

Even with the drawbacks, there are certain applications where a low density foam mattress makes sense:

  • For kid’s rooms and bunk beds
  • As a guest room, sofa bed, or floor mattress
  • In RVs, campers, and trailers where weight is a consideration
  • For sleepers under 150 lbs who want pressure relief
  • On a tight budget but need better than a spring mattress

Heavier individuals and those seeking more nightly support are better suited to a medium-density foam mattress or hybrid mattress.

Types of Low Density Mattress Foam

There are a few different types of foam you may see used in low density mattresses:

Polyurethane Foam

The most common is polyurethane foam – often referred to as “poly foam”. This petroleum-based foam has an open-cell structure to allow airflow. In a low density format, polyfoam is soft, affordable, and conforms closely. However, it can sag and deteriorate faster than denser options.

Memory Foam

Memory foam is made from polyurethane but has special viscoelastic properties. This allows it to fully conform to the contours of your body based on temperature and pressure. Low density memory foam provides targeted pressure relief but lacks support.

Latex Foam

All-natural or blended latex foam is more breathable, responsive, durable, and eco-friendly than polyurethane foam. However, 100% natural latex can be expensive, so lower density latex tends to use synthetic latex. This is conforming and prevents heat buildup but is less durable.

Gel Memory Foam

This NASA-developed foam has cooling gel beads infused into viscoelastic memory foam. The gel helps dissipate body heat away from you while sleeping. Low density gel memory foam provides a cooler, more comfortable sleep experience.

Here is how the main low density foam types compare to each other:

Foam TypeFeelClose ConformingBreathabilitySupportDurabilityCost
PolyurethaneSoft, cushioningYesModerateLowLowCheapest
Memory FoamBody-huggingExceptionalLowVery LowLowAffordable
LatexResponsive, buoyantModerateHighModerateModerateMid-range
Gel Memory FoamCooling, cushionedYesHighLowLowMid-range

As you can see, each foam type has trade-offs between conforming ability, coolness, support, and durability. Consider what attributes are most important for your situation when choosing between types of low density foam.

What To Look For When Buying

If you’ve decided a low density foam mattress meets your needs and budget, here are some key factors to evaluate:

Density And Thickness

Aim for 2.5-3 lb density foam that is 8-10 inches thick. Very low 1-2 lb foam lacks durability. Over 10 inches thick can feel excessive.

Firmness Level

Choose soft to medium firmness that suits your sleep position. Firmer feels more supportive initially but softens over time.

firmness scale chart

Foam Type

Consider differences in support, cooling, bounce, and value between poly foam, memory foam, and latex options before deciding.


Look for CertiPUR-US certification to ensure durability and low VOC emissions.


Make sure there is a decent sleep trial window and at least 5-year limited warranty in case of issues.


Read third party site reviews and consider the brand’s reputation when evaluating quality.

Firmness Scale for Foam Mattresses

To find your ideal level of softness or firmness, it helps to understand mattress firmness ratings. These range on a 1-10 scale from soft to firm:

  • 1-3 – Very plush and soft
  • 4-6 – Medium soft to medium firmness
  • 7-9 – Firmer with some pushback support
  • 10 – Very firm with almost no give

Back and stomach sleepers tend to prefer firmer mattresses in the 7-9 range. Side sleepers are often most comfortable in the 4-6 medium softness range.

Most low density foam mattresses fall in the medium to medium-soft range. However, some brands offer multiple firmness options. Deciding on the right level of firmness is crucial for supporting and minimizing pressure points.


Low density foam mattresses can provide an affordable way to enjoy conforming comfort and pressure relief for lightweight sleepers. Key benefits include exceptional close contouring, cooler sleep, budget price tag, ease of movement, and transport.

That said, low density foam comes with drawbacks like quicker sagging and lack of support for heavier body types. Carefully consider your sleep needs and preferences before choosing a mattress in the 2-3 pound density range.

Those looking for better nightly support are advised to explore mattresses featuring 4+ pound density foam or hybrid designs with innerspring coils. But when utilized properly, a quality low density foam mattress can provide just the right blend of cushioning comfort, and cooling.

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