The right pillow keeps your head, neck and spine in a straight line. So your sleep position is the biggest factor. Side sleepers need a higher, firmer pillow. Back sleepers need a medium one. Stomach sleepers need a low, soft pillow.
After position, match the loft to your shoulder width. Then pick a fill type for the feel, heat and support you want. Height is the make-or-break measurement, so size that first.
- Loft is the number that matters: low is 3 inches or less, medium 3 to 5 inches, high over 5 inches.
- Broad shoulders need more loft. A softer mattress lets you drop a little, because the shoulder sinks in.
- Fill (foam, latex, down, buckwheat) sets the feel and heat, not the loft. Latex and buckwheat sleep coolest.
- An adjustable, shredded-fill pillow lets you add or remove stuffing to dial in the exact height.
- Pillow size (standard, queen, king) is about the bed and case, not neck support. A bigger pillow is not a higher one.
Not sure how thick your pillow should be? Loft keeps your neck aligned, and it depends on your position, shoulder width and mattress. Get a number before you buy with the pillow height calculator.
Why Does Sleep Position Decide The Pillow?
Position sets the gap between your head and the mattress, and the pillow has to fill it. The goal is a straight line from your head to your shoulders and back, down to your hips, knees and feet.
A pillow that is too thick, too flat or too high lacks support and can strain your neck (Sleep Foundation). Loft, the height of the pillow, controls this. Sleep Foundation groups loft into low (3 inches or less), medium (3 to 5 inches) and high (over 5 inches) (Sleep Foundation).
What Loft And Firmness Suit Each Sleep Position?
Each position needs a different loft and firmness to keep the spine neutral.
- Side sleepers need high loft and a firmer feel. A pillow at least 4 inches thick fills the wide space between the head and the mattress. Too little height lets pressure points build around the neck and shoulders (Sleep Foundation).
- Back sleepers do best with medium loft and medium firmness. A mid-loft pillow (about 3 to 5 inches) supports the natural curve of the neck without pushing the head forward (Sleep Foundation). Medium firmness is usually the most comfortable (Sleep Foundation).
- Stomach sleepers need low loft and a soft pillow. A pillow 3 inches thick or less keeps the head and neck low and in line with the spine. The neck does not bend upward all night (Sleep Foundation).
If you switch positions at night, a mid-loft pillow is the safest all-rounder. An adjustable pillow you can tune also works (covered below) (Sleep Foundation). To see which pillow styles suit your position and firmness preference, use the mattress and sleep position calculator.
How Does Shoulder Width Change The Loft You Need?
The wider your shoulders, the more loft you need on your side. Broad shoulders open a bigger gap between the head and the mattress. A side sleeper with wide shoulders may need over 6 inches, while narrow shoulders sit comfortably lower (Sleep Foundation).
Mattress firmness matters too. On a soft bed the shoulder sinks in and shrinks the gap, so you need slightly less loft than on a firm one. The pillow height calculator works out this mix for you, so you do not have to guess.
Which Pillow Fill Type Should You Choose?
Fill decides the feel, how well the pillow holds its shape, and how hot it sleeps. Position still sets the loft. Here is how the common fills compare.
| Fill type | Feel and support | Heat | Good to know |
|---|---|---|---|
| Memory foam (solid) | Molds to the head and neck for pressure relief and support | Tends to trap heat unless gel-infused or open-cell | Contoured cervical versions are made for neck support |
| Shredded memory foam | Traditional, moldable feel; many are adjustable | More breathable than solid foam | Add or remove fill to set your own loft and firmness |
| Latex | Responsive support that cushions the head | Breathable, especially when aerated or shredded | Comes in solid or shredded forms |
| Down | Light and plush; compresses under the head | Generally warm | Pricey and may trigger allergies; needs fluffing |
| Down alternative | Soft, lightweight, moldable polyester | Usually cooler than real down | Affordable and easy to care for |
| Feather | More support than down; often blended with it | Varies | Needs regular fluffing; quills can poke through |
| Buckwheat | Firm, heavy and very supportive; adjustable hull fill | Excellent airflow, sleeps cool | The hulls rustle when you move |
Source: Sleep Foundation.
Should You Choose An Adjustable Pillow?
An adjustable pillow is the easiest way to land on the right loft. You set the height yourself instead of hoping a fixed pillow fits.
These pillows are filled with shredded memory foam, down or down alternative. They open up so you can add or remove filling to change the loft and firmness (Sleep Foundation). That makes them a smart pick if you switch positions, have unusual shoulder width, or do not know your number yet.
Start with the pillow full. Then take fill out until your head sits level. Keep the spare fill to top it up as it settles. The adjustable Coop Home Goods pillow in our reviews is built around this add-or-remove design.
What Pillow Size Should You Buy: Standard, Queen Or King?
Size is about the bed and the pillowcase, not your neck. Settle the loft first and the size second. The three common sizes suit different beds and uses (Sleep Foundation).
| Size | Approx. size | Best for |
|---|---|---|
| Standard | 20 by 26 in | Most sleepers; twin beds, or pairs on full and queen beds |
| Queen | 20 by 30 in | Restless sleepers who change sides; queen beds |
| King | 20 by 36 in | King and California king beds; doubles as a backrest |
Source: Sleep Foundation.
Which Pillow Is Best For Neck Pain?
A pillow that keeps the neck aligned with the spine. That usually means the right loft for your position, not a special gadget. Avoid pillows that are too thick, too flat or too high, because all of them strain the neck (Sleep Foundation).
Sleep Foundation suggests a neck-support pillow 3 to 5 inches thick for side and back sleepers, and 3 inches or less for stomach sleepers. It also suggests a firmer pillow for side sleeping and medium firmness for back sleeping (Sleep Foundation).
Contoured cervical pillows, often memory foam, are shaped to cradle the neck and can help some people (Sleep Foundation). The contoured EPABO contour memory foam pillow is one example of this style in our reviews.
What Is The Best Pillow For Hot Sleepers?
Breathable fills and open structures sleep coolest. Latex is more breathable than synthetic foam. Buckwheat hulls create air pockets that prevent heat building up. Down alternative resists heat better than real down (Sleep Foundation).
Among foams, shredded beats solid because air can move through the fill. Gel or copper infusions pull heat away from the body (Sleep Foundation). Covers in cotton, wool or bamboo, and ventilated mesh panels, add to the cooling effect (Sleep Foundation).
How Many Pillows Do You Need?
One well-chosen head pillow is usually enough. Stacking a second under your head tends to push the neck out of line. The more useful extra pillow goes with your body, and which one depends on your position.
Side sleepers can put a pillow between the knees. It keeps the hips and spine in a neutral line and eases lower-back and hip strain (Sleep Foundation). Back sleepers do better with a pillow under the knees to relieve lower-back tension, rather than between them (Sleep Foundation).
Stomach sleepers usually do not need a knee pillow. A thin, low head pillow keeps the neck flattest (Sleep Foundation). A full-length body pillow can stand in for a knee pillow if you like something to hug.
How Do You Test A Pillow Before You Commit?
Lie down in your usual sleep position and check your alignment. A pillow that feels nice to the hand can still bend your neck. Finding the right pillow often comes down to trying different types until your head, neck and spine stay in a straight line (Sleep Foundation). A few checks:
- Lie on your side or back as you normally sleep. Have someone check that your nose lines up with the center of your chest, with no tilt up or down.
- Give it a few nights, not a few minutes. A new loft can take time to judge.
- Favor pillows with a sleep trial or an adjustable fill, so you can change the loft if the first setting is wrong.
- Note whether you wake with a stiff neck or shoulder. That points to the wrong loft or firmness.
Want help picking a specific model? In our hands-on pillow testing we compare loft, firmness and fill across sleep positions. Browse the pillow reviews, including the adjustable Coop Home Goods pillow you can tune to your own height.
A new pillow should ease neck discomfort, not cause it. See a doctor or physical therapist if neck or shoulder pain lasts more than a couple of weeks, wakes you at night, or comes with numbness, tingling or headaches. No pillow treats a medical neck problem.
How Often Should You Replace The Pillow You Choose?
A worn pillow loses the loft that keeps your neck aligned, so even the right choice stops working over time. For lifespan by fill and the signs of a worn-out pillow, see how often you should replace your pillow.
Pillow Buying FAQs
What Is The Most Important Thing When Choosing A Pillow?
Loft that matches your sleep position and shoulder width, so your head, neck and spine stay in a straight line. Fill type decides the feel after that.
Is A Firm Or Soft Pillow Better?
It depends on position. Side sleepers do best with a firmer pillow, back sleepers with medium firmness, and stomach sleepers with a soft, low pillow.
What Loft Do I Need For My Pillow?
Roughly 4 inches or more for side sleeping, 3 to 5 inches for back sleeping, and 3 inches or less for stomach sleeping. Adjust for shoulder width. The pillow height calculator gives a tailored number.
Which Pillow Fill Lasts The Longest?
Fill is the main driver of lifespan. See how often to replace your pillow for the full breakdown by material.
What Pillow Is Best If I Get Hot At Night?
Breathable fills sleep cooler than solid memory foam. Latex, buckwheat, down alternative, and shredded or gel-infused foam all fit.
Can The Wrong Pillow Cause Neck Pain?
Yes. A pillow that is too high, too flat or too firm for your position bends the neck out of line. That can leave you stiff or sore.