How to Choose a Pillow

A pillow has one job: keep your neck level with the rest of your spine. How much height that takes is set almost entirely by the position you sleep in — get the loft right and a cheap pillow feels great; get it wrong and the priciest one gives you a stiff neck. Here is how to choose.

By Stephen V., EnthusiastLast updated July 29, 2026

A pillow looks like the simplest thing you'll ever buy for your bed, which is exactly why so many people own a drawer full of ones they don't like. The problem is that almost everyone shops for a pillow the way they'd shop for a cushion — they squeeze it, decide whether it feels nice in the hand, and buy the plush one. That is the wrong test. A pillow isn't there to feel good against your palm in a shop. It is there to do one structural job: fill the gap between your head and the mattress so your neck stays level with the rest of your spine for the seven or eight hours you're lying on it.

Get that gap right and a cheap pillow feels great. Get it wrong and the most expensive pillow in the world gives you a stiff neck, because your head spends the night propped too high or dropped too low. Everything that actually matters about a pillow follows from the size of that gap — and the size of that gap is set almost entirely by one thing: the position you sleep in.

The master variable is your sleeping position

Before you read a single spec, answer one question honestly: where does your body actually settle for most of the night? Not how you fall asleep, not how you'd like to sleep — where you spend the hours. That answer decides how much loft (the height of the pillow) you need, and loft is the one variable that 99% of a good pillow decision comes down to. Each of the three positions presents a different shape to the bed and so leaves a different gap to fill.

Side sleepers need a high, firm loft.Lie on your side and the distance from your ear to the mattress is the width of your shoulder — the biggest gap of any position. You need a pillow tall enough and firm enough to fill it without collapsing, so your head is held level and your neck doesn't bend down toward the bed all night. Softness is the enemy here: a pillow that compresses lets your head sink and undoes the whole point. If you sleep on your side, start with our picks for side sleepers, which rank by exactly that height-and-firmness problem.
Back sleepers need a medium loft. On your back the gap is smaller — just the natural curve of your neck behind your head. A medium loft supports that curve without shoving your chin toward your chest. Too tall and your head is pushed forward all night; too flat and your neck loses its support and your head tips back. A contour shape, which cradles the neck and lets the head settle a touch lower, is built precisely for this position. Our back-sleeper picks walk through the medium-loft options and where a contour earns its keep.
Stomach sleepers need a very low loft, or none. Face down, there is almost no gap at all — your head is already close to the mattress. Any real height cranks your neck backward and sideways for hours, which is why stomach sleeping is the position most likely to wreck a neck. The right pillow here is the flattest, softest one you can find, and some stomach sleepers genuinely sleep better with no head pillow at all and a thin one under the hips instead. See the stomach-sleeper picks for how low is low enough.

If you switch positions through the night — and plenty of people do — choose for the position you spend the most time in and lean toward an adjustable pillow so you can compromise on the loft rather than being locked to one shape. A fixed contour is wonderful for a committed back sleeper and a nuisance for someone who rolls onto their side at 2am.

Then choose the fill — honestly, this is where the marketing lives

Once you know the loft your position needs, fill type is the next decision. It's where nearly all the advertising noise is, so it's worth cutting through to what each material is actually good and bad at.

Solid memory foam.A single moulded block, often in a contour shape. Its virtue is that it holds one precise shape all night, so the support you feel at lights-out is the support you get at dawn — ideal for a contour pillow whose whole point is geometry. Its costs are that it can't be adjusted and it sleeps the warmest of anything here, because a solid block wraps your head and traps heat. Best for back sleepers and neck pain; worst for hot sleepers and anyone who moves around.
Shredded / adjustable memory foam.Chopped-up foam in a bag that unzips. It vents far better than a solid block because there are air gaps running all through it, it holds height under weight, and — the big one — you can add or remove fill to set the loft yourself. This is the material that suits the most people, because it sidesteps the hardest part of pillow shopping: you don't have to know your ideal height in advance, you just pull out handfuls until your neck sits level and stop. The catch is that it only helps if you actually open the zip, and it needs an occasional re-fluff. Best all-rounder, especially for side sleepers and anyone unsure.
Down and feather.Natural fill, soft and mouldable, with a luxurious hand-feel. It breathes reasonably and you can punch it into shape, but it compresses under the head and won't hold a tall, firm loft — so it flatters back and stomach sleepers more than side sleepers. Downsides: it can poke through the cover with quills, it needs frequent fluffing, and it's a poor choice for anyone with a down allergy.
Down alternative. Soft synthetic fibre, mostly air by volume. It breathes well, washes easily, costs the least, and feels lovely on night one. What it will not do is hold a tall, firm shape — it collapses under your head — which makes it right for back and stomach sleepers and wrong for side sleepers. Treat it as a consumable: it flattens faster than foam.
Latex.A springier, more responsive foam than memory foam. It holds loft and support like solid foam but sleeps cooler and bounces back faster instead of slowly sinking. It's durable and naturally resists dust mites. Downsides: it's heavier, pricier, and its firm, buoyant feel isn't for everyone. A good pick for a side or back sleeper who wants foam support without the memory-foam heat and slow response.
Buckwheat.Hulls that pour to fit your neck and let a lot of air through, so they sleep very cool and hold whatever shape you pack them into. You can add or remove hulls to set the loft. The trade is that they're firm, heavy, and rustle audibly when you move — people tend to either love the tailored, breathable support or find the noise and weight a dealbreaker.
Cooling gel.Worth calling out because it's more a feature than a fill. Gel layers and cool-touch covers feel genuinely cold when you first lie down, because they pull heat from your skin — but they warm to your body within minutes and then they're just pillow. What keeps working all night is airflow, not gel. More on that below.

Firmness is not the same as loft

Loft is how tall the pillow is; firmness is how much it resistsyour head. They interact, and confusing the two is a common way to buy the wrong pillow. A side sleeper needs both height and firmness, because a soft pillow at the right height still collapses the moment a shoulder's worth of weight lands on it. A stomach sleeper wants low andsoft, so the little height there is gives way and the neck stays neutral. A back sleeper sits in the middle: a medium loft with medium firmness that yields enough to cradle the head but holds enough to keep the neck supported. When you read a listing, check both — a firm pillow at the wrong loft, or a tall pillow that's too soft to hold that loft, will both leave your neck bent.

Your mattress quietly changes the right loft

Here's the factor almost no pillow guide mentions: the pillow you need depends on the bed underneath it. A soft mattress lets your shoulder and hip sink in, which shrinks the gap between your head and the surface — so on a plush bed you need a lowerpillow than you would on a firm one, where you sit more on top and the gap stays wide. This matters most for side sleepers, because the shoulder is the part doing the sinking. It's why a pillow that was perfect in your old bed can feel suddenly too tall in a new, softer one — the pillow didn't change, the amount of gap it has to fill did. Choose the two together. If you're still setting up the rest of the bed, our overall best-pillow guide pairs each position with a fill, and matching the mattress firmness to your position first makes the pillow choice far easier.

Cooling: airflow beats adjectives

If you sleep hot, ignore the word "cooling" on the bag and think about structure instead. The reason some pillows sleep warm is simple: a solid block of foam wraps your head and has nowhere for heat to go. "Cooling gel" and cool-touch covers change when you get hot, not whether— they feel cold for the first few minutes and then warm to your body and stop. What actually works all night is air moving through the pillow, which means loose fill: shredded foam with gaps running through it, down alternative that's mostly air, buckwheat hulls, or latex, which is naturally more breathable than memory foam. If heat is your main complaint, buy an airy fill or a ventilated foam rather than chasing a printed cooling claim onto a solid block that traps heat by its nature.

When to replace it: the fold test

A pillow is a consumable, and most people are sleeping on one that gave up its support a year or more ago — which is a big part of why they think they need a new mattress. How long a pillow lasts depends on the fill: a down-alternative or fibre pillow is genuinely a one-to-two-year purchase, because it compresses and mats and no amount of fluffing brings the loft back; solid and shredded memory foam and latex last longer, because they recover their shape rather than matting flat, but none of them is immortal. The test works on all of them, and it takes five seconds: fold the pillow in half and let go. If it springs back open, it still has life in it. If it just lies there folded, the support is gone and it's time for a new one. There's also a hygiene reason to move on — pillows absorb sweat, oil and skin over the years. Regular washing buys you cleanliness but not loft, so it's worth knowing how to wash a pillow properly to get the full life out of one before the fold test calls it.

Putting it together

Choosing a pillow is really four decisions in order, and the first one does most of the work. Start with your sleeping position, because it sets the loft: high and firm for side, medium for back, low or nothing for stomach. Then pick a fill that can hold that loft — foam and latex when you need real height and support, soft fills when you need give and airflow, shredded and adjustable when you'd rather tune it than guess. Check that firmness matches the job, remember that a softer mattress wants a lower pillow, and if you run hot, choose an airy fill over a cooling buzzword. Then replace it when it fails the fold test.

And the honest caveat we put on everything here: we haven't slept on every pillow, because there's no test lab behind this site. What this guide gives you is the geometry and the physics so you can judge a listing yourself — the same method we use on the roundups. If you already know your position, jump straight to it — the side, back and stomach pages each rank the right loft for that sleeper, and if you wake with a stiff neck whatever your position, our pillow for neck pain page is the place to start.

Common questions

What kind of pillow is best for my sleeping position?

Match the loft to the gap your position leaves between your head and the mattress. Side sleepers have the biggest gap — the width of a shoulder — so they need a tall, firm pillow that holds that height without collapsing, or the head drops and the neck bends toward the bed all night. Back sleepers have a smaller gap, just the curve of the neck, so they want a medium loft that supports that curve without pushing the head forward; a contour shape suits many of them. Stomach sleepers have almost no gap at all, so they need the thinnest, softest pillow they can find, or none — any real height cranks the neck backward for hours. Work out which of the three you are before you think about fill, brand or cooling, because none of that matters if the loft is wrong.

How high should my pillow be?

There is no universal number, because the right loft depends on the width of your shoulders, how far your head sinks into your mattress and the position you sleep in — variables no product page can know. The test that works for everyone is a mirror: lie down in your normal sleeping position and look at the line of your neck. If your head is tipped up toward the ceiling, the pillow is too tall; if it is dropped down toward the mattress, it is too short. You want your nose pointing straight ahead and your neck a smooth continuation of your spine, not a bend in it. This is exactly why adjustable pillows are popular — you add or remove fill until that line is level instead of guessing the height in advance.

Is memory foam or down better for a pillow?

Neither is better in general; they are good at opposite jobs. Memory foam — solid or shredded — holds its loft and support all night, which is what you want when the pillow has real work to do, like filling a side sleeper's shoulder gap or supporting a sore neck. Its downsides are that a solid block sleeps warm and cannot be adjusted. Down and down alternative are soft, breathable and light, which makes them ideal for back and stomach sleepers who need less height and more give — but they compress under the head, will not hold a tall shape, and flatten faster. Pick foam when you need height and support, and a soft fill when you need softness and airflow. Shredded memory foam, which is adjustable and vents better than a solid block, is the middle ground that suits the most people.

How often should I replace a pillow?

It depends on the fill, and most people wait far too long. A down-alternative or fibre pillow is roughly a one-to-two-year item — it compresses and mats and stops holding loft, and no amount of fluffing brings it back. Solid and shredded memory foam last longer, often several years, because foam recovers its shape rather than matting flat. A quick test works on any of them: fold the pillow in half, and if it just lies there instead of springing back open, it is finished. Beyond support, pillows absorb a surprising amount of sweat, oil and skin over time, which is its own reason not to nurse a flat one for a decade — washing helps, but it does not restore lost loft.

Does my mattress change which pillow I need?

Yes, more than most people realise, and it is why a pillow that was perfect in one bed feels wrong in the next. A soft mattress lets your shoulder and hip sink in, which shrinks the gap between your head and the surface — so you need a lower pillow than you would on a firm bed, where you sit more on top and the gap stays wide. This matters most for side sleepers, whose shoulder is doing the sinking. If you have just switched to a plush new mattress and your old pillow suddenly feels too tall, that is why. The pillow and the mattress have to be chosen together, not in isolation.

Sources

Where the facts on this page come from. We cite other people's testing because we don't do our own — here's what that means.