How to Buy the Best Memory Foam Mattress: A Practical Guide
Our recommendations are based on hands-on testing in 5 LA showrooms and feedback from 3,300+ verified customers.
How to Buy the Best Memory Foam Mattress: A Practical Guide
Memory foam remains one of the most popular mattress types for good reason — it contours to your body, absorbs motion, and can relieve pressure in a way that spring mattresses can't match. But not all memory foam mattresses are created equal, and buying the wrong one is an easy mistake to make.
This guide covers what actually matters when you're shopping: sleep position, firmness, density, foam type, thickness, and certifications. By the end, you'll know exactly what to look for.
02Is Memory Foam Right for You?
Memory foam works well for most sleepers, but it's not universal. Here's a quick read:
- Good fit: Side sleepers, light-to-medium weight sleepers, couples who want motion isolation, people with joint or pressure point pain
- May not be ideal: Stomach sleepers (memory foam can let the midsection sink too deeply), hot sleepers who don't choose a cooling version, people who want a responsive, bouncy feel
If you tend to sleep hot, lean toward gel-infused or open-cell memory foam rather than traditional foam. More on that below.
03Choosing Firmness by Sleep Position
Firmness is the most important decision you'll make. It determines how your spine aligns during sleep — get it wrong and you wake up with pain regardless of how much you paid.
| Sleep Position | Recommended Firmness | Why |
|---|---|---|
| Side sleeper | Soft to Medium | Shoulder and hip need to sink in; reduces pressure |
| Back sleeper | Medium to Medium-Firm | Supports lumbar curve without excessive sinkage |
| Stomach sleeper | Firm | Prevents hips from dropping below the chest line |
| Combination sleeper | Medium | Works for multiple positions; allows position changes |
Body weight matters too. Heavier sleepers compress foam more deeply — if you're over 230 lbs, size up one firmness level from what the chart suggests. Lighter sleepers (under 130 lbs) may find firm options feel harder than expected.
04Memory Foam Types Explained
There are four main types of memory foam. Each performs differently:
Traditional Memory Foam
The original. Dense, slow-responding, excellent at contouring. The main downside is heat retention — the foam traps warmth, which can disrupt sleep for warm sleepers.
Gel-Infused Memory Foam
Gel beads or liquid gel are blended into the foam. This improves temperature regulation and gives the foam a slightly different feel — slightly cooler and marginally more responsive. A solid upgrade for moderate hot sleepers.
Open-Cell Memory Foam
The cellular structure is designed to allow airflow through the foam rather than trapping it. More breathable than traditional foam, with a similar feel. Good choice for people who like the memory foam feel but run warm at night.
Airflow (Channel) Memory Foam
Channels or perforations are cut into the foam to actively circulate air. The most effective at heat dissipation, though the feel can be slightly different from traditional memory foam.
| Type | Feel | Cooling | Best For |
|---|---|---|---|
| Traditional | Slow, deep contour | Poor | Cold or neutral sleepers |
| Gel-infused | Slightly firmer, cooler | Moderate | Moderate hot sleepers |
| Open-cell | Similar to traditional | Good | Hot sleepers who love foam feel |
| Airflow/Channel | Slightly different texture | Very good | Consistent hot sleepers |
05Why Density Matters More Than You Think
Density tells you how much foam material is packed into each cubic foot. It's measured in lbs/ft³ and is one of the most reliable indicators of mattress quality and lifespan.
What the Numbers Mean
- Under 3 lbs/ft³ — Low density. Prone to sagging and body impressions. Common in budget mattresses.
- 3–4 lbs/ft³ — Medium density. Good balance of durability and comfort. Works for most sleepers.
- 4+ lbs/ft³ — High density. More durable, better support, slower response. Often found in premium mattresses.
Higher density cores resist body impressions, maintain support over time, and tend to last longer. If you're shopping for a mattress you want to use for 8–10 years, prioritize density in the support core layer.
One caveat: Higher density foams also retain more heat. If you go with a high-density core, make sure the comfort layer uses gel, open-cell, or channel foam to compensate.
06How Thick Should Your Mattress Be?
Thickness affects comfort, feel, and practicality. Here's a simple guide:
| Thickness | Best For | Consider |
|---|---|---|
| 8–10" (Thin) | Platform beds, bunk beds, guest rooms | Less pressure relief; fine for lighter sleepers |
| 10–12" (Standard) | Most sleepers and bed frames | Good balance; works for the widest range of people |
| 13"+ (Thick) | Heavier sleepers, plush comfort seekers | May need deep-pocket sheets; check bed frame height |
Most people do well with a 10–12" mattress. Thicker options are worth considering if you're over 200 lbs or if you want an especially plush surface.
07What CertiPUR-US® Actually Means
CertiPUR-US® is the main certification to look for when buying memory foam. It means the foam has been tested by an independent laboratory and certified to be:
- Free from ozone depleters
- Free from prohibited flame retardants (PBDEs, TDCPP, TCEP)
- Free from mercury, lead, and other heavy metals
- Free from formaldehyde
- Free from phthalates regulated by the Consumer Product Safety Commission
- Low in volatile organic compounds (VOCs) — under 0.5 parts per million
Most reputable mattress brands use CertiPUR-US® certified foam. If a brand can't tell you whether their foam is certified, that's a red flag.
08What to Ignore When Shopping
Memory foam marketing is full of noise. Here's what to tune out:
- Layer counts — More layers doesn't mean better sleep. What matters is what the layers are made of.
- "Revolutionary" cooling technology — Gel and open-cell foams do help. Proprietary "cooling" fabric names rarely make a meaningful difference.
- Vague pressure relief claims — All memory foam relieves pressure to some degree. Look for density and foam type, not marketing language.
- Cover fabric thread counts — The cover matters for feel but has minimal impact on sleep quality.
09Where to Try Before You Buy
Reading specs only gets you so far. Memory foam feel varies significantly between brands and models — the only way to know if it's right for you is to lie on it in your actual sleep position for several minutes.
LA Mattress Store's five LA showrooms carry a wide selection of memory foam mattresses across every firmness level and price range. Our sleep specialists can help you narrow down the options based on how you sleep, not just what sounds good on paper.
Every purchase also comes with a 120-night comfort guarantee — so if the mattress isn't working out at home, you can exchange it.
Find a location near you or browse memory foam mattresses online.
10Frequently Asked Questions
What sleep position works best with memory foam?
Side sleepers typically get the most benefit. Memory foam contours to the shoulder and hip, reducing pressure at those points. Back sleepers do well on medium to medium-firm options. Stomach sleepers generally need a firmer surface — either a firm memory foam or a hybrid with coil support.
How does firmness affect sleep quality?
Firmness determines spinal alignment. Too soft and the spine curves downward; too firm and the body isn't cushioned where it needs to be. Matching firmness to your sleep position and body weight is the single biggest factor in whether a mattress works for you long-term.
What's the deal with density?
Density (measured in lbs/ft³) is the main indicator of durability and support quality. Higher density — generally 3.5 lbs/ft³ and above — means better long-term performance and fewer body impressions over time. It also tends to correlate with cost.
Does mattress thickness matter?
For most people, 10–12" is sufficient. Thickness affects how the layers work together and the overall profile. Heavier sleepers and those wanting maximum plushness benefit from 13" and above.
What are the main memory foam types?
Traditional (close-conforming, runs warm), gel-infused (slightly cooler), open-cell (better airflow), and airflow/channel foam (most breathable). Choose based on whether you tend to sleep hot.
Why choose CertiPUR-US® certified foam?
It ensures the foam is free from harmful chemicals and low in VOCs. It's the industry standard for health-conscious consumers and the baseline for any reputable brand.
Are reviews worth reading?
Yes — with caveats. Look for reviews from people with your sleep position, body type, and similar preferences. Ignore reviews that only mention comfort in the first week; it takes 30+ nights to know if a mattress is right for you. Focus on reviews mentioning durability and long-term feel.
Frequently Asked Questions
Side sleepers typically get the most benefit. Memory foam contours to the shoulder and hip, reducing pressure at those points. Back sleepers do well on medium to medium-firm options. Stomach sleepers generally need a firmer surface — either a firm memory foam or a hybrid with coil support.
Firmness determines spinal alignment. Too soft and the spine curves downward; too firm and the body isn't cushioned where it needs to be. Matching firmness to your sleep position and body weight is the single biggest factor in whether a mattress works for you long-term.
Density (measured in lbs/ft³) is the main indicator of durability and support quality. Higher density — generally 3.5 lbs/ft³ and above — means better long-term performance and fewer body impressions over time. It also tends to correlate with cost.
For most people, 10–12" is sufficient. Thickness affects how the layers work together and the overall profile. Heavier sleepers and those wanting maximum plushness benefit from 13" and above.
Traditional (close-conforming, runs warm), gel-infused (slightly cooler), open-cell (better airflow), and airflow/channel foam (most breathable). Choose based on whether you tend to sleep hot.
It ensures the foam is free from harmful chemicals and low in VOCs. It's the industry standard for health-conscious consumers and the baseline for any reputable brand.
Yes — with caveats. Look for reviews from people with your sleep position, body type, and similar preferences. Ignore reviews that only mention comfort in the first week; it takes 30+ nights to know if a mattress is right for you. Focus on reviews mentioning durability and long-term feel.
Shop Memory Foam Mattresses
Body-contouring comfort. Free white glove delivery and 120-night trial.
