Memory Foam Firmness by Sleep Position: A Calm Guide

Read the firmness number on the brand's own scale

A memory foam mattress usually comes in one feel, or in a small set of them, and each brand runs its own scale. That is why the same number can mean different things on two product pages.

• WinkBeds GravityLux is sold in Soft 4, Medium 5 and Firm 7 versions.
• Nolah Original is listed as Medium-Firm (5-6/10).
• Saatva Contour5 is listed as Medium (5-7/10).
• Amerisleep AS3 is listed as a Medium feel in a 12-inch profile.
• Leesa Original lists "medium comfort" with no number at all.

Where a brand gives words instead of a number, the words are the rating. "Medium-firm" and "medium" are different listings, and only the brand decides which one it is selling.

Try This: Copy the brand's exact firmness wording and number into a note before you open a second tab, so you compare their words rather than your memory of them.

Memory foam firmness by sleep position

Sleep position is the filter most brands publish something about. Here is what each one states for the models in our guide, in its own words.

• WinkBeds GravityLux: WinkBeds lists Soft for side sleepers, Medium as "a fit for all sleep positions", and Firm for stomach or back sleepers.
• Amerisleep AS3: recommended sleep positions are listed as side and back.
• Saatva Contour5: listed as ideal for side sleepers, "but also great for back and combination sleepers".
• Nolah Original: described as "a great choice for side sleepers" at a medium-firm feel.
• Leesa Original: no sleep positions are stated for this model; Leesa says its support base suits "all body types and sleep positions".

A few things to keep in mind. A brand's recommendation is a starting point, not a fit test. If you change position during the night, note which models are described as fitting more than one. And if you are carrying an injury or a condition that affects how you sleep, speak with a healthcare professional about which feel to look for before you order.

Try This: If you share a bed with someone who sleeps in a different position, write both positions down first, because one feel has to work for both of you.

Cooling: check where it actually sits

Cooling is the second line people scan, and the easiest one to misread. What matters is where the cooling sits and whether it is included in the version you are buying.

• WinkBeds GravityLux: 2" of cooling gel foam is built into the tufted cover, and WinkBeds describes temperature-regulating features for sleeping cooler than many all-foam models.
• Leesa Original: a breathable knit cover is standard, with a cooling quilt top listed as an upgrade, described as cool-to-the-touch with added cushioning.
• Nolah Original: copper-infused Cool Contouring Foam is part of the build, and a Cooling Pillow Top is listed as an upgrade.
• Saatva Contour5: adaptive cooling technology, with a CoolVent System described as absorbing and dispersing excess body heat.
• Amerisleep AS3: cooling technology is listed on the spec sheet, alongside plant-based Bio-Pur memory foam described for cooling comfort.

The word "upgrade" is the tell. It means the cooling layer is a choice at checkout rather than part of the standard build, so confirm which version you are paying for.

Try This: Before checkout, write down whether the cooling you read about is in the standard build or listed as an upgrade.

Memory foam vs hybrid mattress: sometimes one model, two builds

The foam-versus-hybrid question is usually framed as choosing between two companies. It is sometimes a choice inside one product line: Amerisleep lists the AS3 as an all-foam mattress and also as an AS3h hybrid built from foam and coils.

Three other picks in our guide are listed as all-foam constructions: the Leesa Original, the Nolah Original and the Saatva Contour5. WinkBeds lists the GravityLux construction as a TENCEL® cover with gel-infused foam, AirCell™ memory foam, Progression Foam™ and ATLAS Core™ Foam, and describes temperature-regulating features for sleeping cooler than many all-foam models. So the build question and the brand question can be answered separately.

If you are replacing a mattress that no longer feels supportive, start with the build the maker lists for your sleep position, then compare layers, cooling and trial terms within it.

Try This: If a model you like comes in both builds, check whether the maker's sleep-position guidance changes between the all-foam and hybrid versions before you choose.

If you need a memory foam twin mattress

Twin sizes are where measurement pays off, because frames and room layouts are less forgiving. Two listings from the guide:

• WinkBeds GravityLux: Twin 38" x 75", Twin XL 38" x 80".
• Leesa Original: Twin 38" x 75" x 10", 45 lbs; Twin XL 38" x 80" x 10", 48 lbs.

The weight line is worth reading twice. A twin listed at 45 or 48 lbs is a deliberate thing to carry upstairs, and it is also what you will be lifting when the cover needs airing. Check that the size you need is listed in the feel you want, and confirm the base requirement with the brand, since Nolah lists slats no more than 5.5 inches apart for its mattress.

Try This: Measure the frame's width, length and slat gap before ordering, and note the mattress weight somewhere you will see it on delivery day.

What about a memory foam mattress topper?

Our buying guide covers full mattresses, and every spec in it is for a mattress rather than a topper. We researched mattresses, so we cannot tell you how a particular topper compares.

If you are weighing a topper against a replacement, use the same checks you would use on a mattress page: the maker's own firmness wording, whether cooling is built in or listed as an upgrade, and the trial and warranty terms. Those are the lines we compare in the mattress guide, and a topper listing should answer all of them.

Try This: Ask a topper maker the same questions you would ask a mattress maker: what firmness wording it uses, and whether cooling is built in or an upgrade.

Is this just paid placement?

Fair question, and worth answering plainly. Our memory foam mattress buying guide states how it was built: models were shortlisted from independent buying guides, then compared on what each manufacturer publishes on its own product page. The specs were checked in October 2026, and prices, trials and warranties were rechecked later that month.

The guide states that it is not hands-on tested and that brands cannot pay for placement. It discloses that some links earn a commission at no extra cost to you, and every link goes to the maker's own site. Where a brand does not publish something, such as Saatva's Queen dimensions or a foam certification for WinkBeds and Amerisleep in the details reviewed, the table says so rather than filling the gap.

That is the honest limit of a research-based guide. We can tell you what a brand publishes about firmness, cooling, size and warranty. We cannot tell you how a mattress will feel under you, which is what the trial period is there for.

Try This: Open the brand's product page next to the guide and check a few spec lines yourself. It is the fastest way to judge any review site.