How to Choose a Mattress Topper: Materials, Thickness and Firmness
A mattress topper is one of the cheapest ways to change how your bed feels. We also reviewed the NEW JETO Metal Bed Frame if you want to compare. It can soften a firm mattress, add comfort to a guest bed or buy a tired mattress a little more time. It cannot fix everything, though. This guide explains which materials, thicknesses and firmness levels suit different sleepers, and when a topper is the wrong answer.
Affiliate disclosure: HashMonkey is reader-supported. We earn a commission if you buy through our Amazon links, at no extra cost to you. This guide is based on manufacturer and listing information and general buying knowledge; we have not tested these products hands-on, and we do not list prices because they change often.
What a topper can and cannot do
A topper is a removable layer, usually two to four inches thick, that sits on top of your mattress under the fitted sheet. It changes the feel of the sleep surface: making it softer, adding pressure relief at the shoulders and hips, or adding a plush, pillowy layer.
What a topper cannot do is repair a mattress with deep sagging, broken springs or a lumpy core. A topper follows the shape of whatever is underneath it, so if your mattress has a dip, the topper will dip too. If you wake with back pain on a mattress that is visibly sagging, a new mattress is usually the better investment.
Toppers are ideal when your mattress is structurally sound but too firm, when you want to make a guest bed, dorm bed or RV mattress more comfortable, or when you want to try a softer feel before replacing a whole mattress.
Topper materials compared
Memory foam contours closely to your body and is excellent at relieving pressure points. It can give a slow-sinking, hugging feel that some people love and others find trapping. Traditional memory foam can retain heat, so many modern versions add gel, open-cell structures or other cooling features.
Gel-infused memory foam is memory foam with gel particles or swirls added, intended to help it feel cooler. It still contours like memory foam, though how much cooler it feels varies by product and by person.
Latex is springier and more responsive than memory foam, so you sit more on top of it than in it. It is durable and tends to sleep cooler, but it is heavier and often more expensive.
Fiber-filled or down-alternative toppers (sometimes sold as pillow tops or featherbeds) add a soft, plush layer rather than deep pressure relief. They feel cozy and are easy to wash in some cases, but they compress over time and need regular shaking out to stay fluffy.
Thickness and firmness by sleep position
Two inches is enough to soften the feel of a mattress slightly and add a little cushioning. Three inches is a popular middle ground and makes a more noticeable difference. Four inches gives the most change but can make a bed feel very different and may make fitted sheets too tight.
Side sleepers usually benefit from a softer, thicker topper so the shoulders and hips can sink in and the spine stays aligned. Back sleepers often do best with medium firmness, enough cushioning without letting the hips sink too far. Stomach sleepers generally need a thinner, firmer topper, because too much softness lets the hips sag and arches the lower back.
If you share a bed with someone who sleeps in a different position, a medium three-inch topper is often a reasonable compromise. Heavier sleepers will compress a topper more and may want a denser or thicker option.
Heat, smell, size and care
If you sleep hot, look for gel infusion, open-cell foam, latex, or a breathable cover. Breathable sheets made from cotton percale or linen also make a real difference with any foam topper.
New foam often has a temporary smell when unpacked, called off-gassing. Let the topper expand in a well-ventilated room for a day or two before using it. Look for certifications such as CertiPUR-US on foam products, which indicates the foam has been tested for certain substances and emissions.
Measure your mattress, including depth, before you buy. A topper adds height, so you may need deep-pocket fitted sheets. A topper with a removable, washable cover or with straps at the corners is easier to live with because it stays in place.
Rotate the topper every few months to even out wear, and use a mattress protector over it to keep it clean.
Common mistakes to avoid
Buying a topper to fix a sagging mattress. It will not fill the dip.
Going too soft as a stomach sleeper. The extra plushness can strain the lower back.
Ignoring the expansion time. Compressed foam toppers can take a day or more to reach full thickness, so judge the feel after it has fully recovered.
Forgetting about your sheets. A thick topper on a deep mattress can leave standard fitted sheets popping off the corners.
Quick buying checklist
- Confirm your mattress is supportive and not sagging before buying a topper.
- Choose material by feel: memory foam for hug, latex for bounce, fiber for plushness.
- Pick thickness by how big a change you want: two, three or four inches.
- Match firmness to sleep position, softer for side sleepers and firmer for stomach sleepers.
- Look for cooling features if you sleep warm, and pair them with breathable sheets.
- Measure mattress depth and check that your fitted sheets will still fit.
- Allow time for expansion and airing out before judging comfort.
How we choose our picks
The HashMonkey Company builds each shortlist from products that are popular in their Amazon category, then narrows it down using manufacturer specifications, the details on each listing and patterns in verified customer reviews. We look for clear information about materials and sizing, sellers with a solid track record and a good fit with the buying advice in this guide. We have not tested these products hands-on, so we do not claim one is objectively the best. Instead, each pick is matched to a specific need, so you can choose the one that fits how you will use it.
We do not accept payment for placement. We earn a commission through Amazon links, which helps keep the site running, but it does not change which products we include or how we describe them. If you spot an outdated detail, please let us know.
Our picks
These products are already on our shortlist. Each “Read more” link goes to our product page with details and who it suits; always confirm the size, specifications and seller on Amazon before you buy.
| Pick | Best for | Details |
|---|---|---|
| Niagara Sleep Solution Ultra-Soft Mattress Topper | Best plush pillow-top feel | Read more · Check price on Amazon |
| Bedlore Queen Mattress Topper | Best value fiber topper | Read more · Check price on Amazon |
| MLILY EGO 2-Inch Gel Mattress Topper | Best thin gel memory foam topper | Read more · Check price on Amazon |
| Olixis 3-Inch Cooling Gel Memory Foam Topper | Best for side sleepers who run warm | Read more · Check price on Amazon |
FAQ
Will a mattress topper fix a sagging mattress?
No. A topper follows the shape of the mattress underneath, so it will sink into a sag. It works best on a mattress that is supportive but too firm.
What thickness of topper should I get?
Two inches for a subtle change, three inches for a noticeable softer feel, and four inches for the biggest change. Side sleepers often prefer three inches or more.
Are memory foam toppers hot?
Traditional memory foam can trap heat. Gel-infused, open-cell or latex toppers and breathable sheets can help.
How long does a topper last?
It depends on material and use. Fiber toppers compress sooner, while denser foam and latex toppers typically last longer. Rotating it helps.
Why does my new topper smell?
New foam can off-gas when unpacked. Airing it out in a ventilated room for a day or two usually reduces the smell.
Product details come from manufacturer and Amazon listing information as of October 2026 and may change. Always confirm the current price, specifications and seller on Amazon before you buy.