Choosing a pillow: fills, loft and firmness for every sleeping position

A pillow has one job: to hold your head so that your neck stays roughly in line with the rest of your spine while you sleep. The right one depends far more on how you sleep, and on your mattress, than on the fill or the label. This guide explains the fills, what loft and firmness mean, and how to match them to side, back and front sleeping.

Start with your sleeping position

Lie on your mattress the way you usually fall asleep and think about the gap the pillow has to fill.

Position	Gap to fill	Typical loft	Typical firmness
Side	From the mattress to the side of your head, roughly the width of your shoulder	Medium to high	Medium to firm
Back	The curve of your neck, without pushing the head forward	Low to medium	Medium
Front (stomach)	Very little; the head turns to one side	Low or very low	Soft
Combination	Changes during the night	Medium, or adjustable	Medium, mouldable

Side sleepers need the most support: too low a pillow lets the head tip down towards the mattress, too high tilts it up. Broad shoulders usually mean a higher pillow.

Back sleepers want enough support for the hollow of the neck without the chin being pushed towards the chest. Contoured pillows with a raised edge for the neck are designed for this position.

Front sleepers turn the neck to one side for hours, so the flattest, softest pillow, or sometimes none, keeps the neck least twisted. A thin pillow under the hips or pelvis is a common suggestion too.

Combination sleepers do best with a medium pillow that's easy to reshape, such as down, shredded foam or one with adjustable fill.

What loft and firmness mean

Loft is the pillow's height when it isn't compressed. Manufacturers often describe it as low, medium or high, sometimes with centimetres. Roughly speaking, low is below about 10 cm, medium about 10 to 13 cm and high above that, but there's no standard.
Firmness is how much the pillow compresses under your head. A high, soft pillow may end up lower in use than a medium, firm one.

What counts is the height under the weight of your head, not the height on the shelf.

Rule of thumb: your mattress changes the answer. On a soft mattress your shoulder sinks in, so you need a lower pillow than on a firm one.

Our guide to mattress types explains how firmness and materials differ.

Down and feather

Down is the soft under-plumage of ducks and geese. Down pillows are light, soft and easy to mould, and they last many years with care. Quality is described by fill power, the volume a given weight of down fills; higher numbers mean loftier, lighter down. The fill power and the down-to-feather proportion are usually on the label.
Feather pillows are heavier and firmer, with less loft for the same weight, and quills can sometimes poke through the cover.
Down-and-feather blends sit between the two. More feather means more support and less cost; more down means softer and lighter.

Down pillows need plumping every day and are usually too soft for side sleepers who need firm support, unless the pillow is very full. Look for traceability standards such as the Responsible Down Standard if animal welfare matters to you. Many people who react to "feather" pillows are actually sensitive to dust mites; covers and regular washing help with that.

Synthetic fibre

Polyester fibre pillows are the most common and cheapest. Better ones use microfibre or cluster fibre (small balls of fibre) that feel closer to down and recover their shape better.

Good for: people with allergies, anyone who wants to wash the whole pillow, and those on a budget.
Consider: fibre flattens and clumps sooner than other fills, so these pillows usually need replacing more often.

The "fold test" is a common check: fold the pillow in half. If it doesn't spring back, it has lost its support.

Memory foam

Memory foam softens with body heat and moulds slowly to your head and neck, then returns to shape when you get up.

Solid foam pillows hold a consistent height all night and come in shaped versions, such as contoured or wave pillows. They give firm, steady support, which many side and back sleepers like.
Shredded foam pillows are filled with foam pieces, so they're easier to reshape, and many have a zip so you can remove fill to adjust the loft.

Memory foam can feel warm, though ventilated designs and gel-infused foams aim to reduce that. New foam often has a smell for a few days; airing it out usually helps. The foam itself generally can't be machine washed, so a removable, washable cover is important. Certifications such as CertiPUR-US cover the content and emissions of foams.

Latex

Latex pillows are made from natural rubber, synthetic latex or a blend. They feel springier and more responsive than memory foam: they push back immediately instead of sinking slowly.

Good for: people who want firm, buoyant support that doesn't flatten, and those who sleep warm, as latex is usually pierced with ventilation holes.
Consider: latex is heavy, and natural latex isn't suitable for anyone with a latex allergy.

Latex keeps its shape longer than most fills.

Other fills

Buckwheat hulls: firm, very adjustable and cool, but noisy when you move and heavy.
Wool: breathable and good at managing moisture, but compacts over time and becomes firmer.
Adjustable or multi-layer pillows: removable inserts or fill let you fine-tune the height, which is useful if you're not sure what you need.

Sizes, covers and certifications

Pillow sizes differ by country. In the UK and Ireland, a standard pillow is about 50 by 75 cm; North American standard, queen and king pillows are longer; and many European countries use square pillows, often 65 by 65 cm or 80 by 80 cm. Check that pillowcases match.

Covers matter too. A tightly woven cotton cover keeps down and fibre in, and a zip-off pillow protector shields the pillow from sweat and stains. Labels such as OEKO-TEX STANDARD 100 indicate that textiles have been tested for certain harmful substances. For more on sheet and duvet materials, see our bedding materials guide.

Care and when to replace

Use a pillow protector and wash it with your bedding.
Fibre and many down pillows can be machine washed; follow the label and dry them thoroughly, as damp fill clumps and can smell.
Foam and latex cores usually can't be washed: wash the cover and spot clean the core.
Plump down and fibre pillows every day, and air them now and then.
Replace a pillow when it stays flat, has lumps, smells, or when you wake with neck stiffness that wasn't there before. Fibre pillows usually wear out first; latex and good down last longest.

If you have ongoing neck or shoulder pain, ask a doctor or physiotherapist for advice on support.

The short version

Choose the loft by your sleeping position: higher for side, medium for back, low for front.
Adjust for your mattress: softer mattress, lower pillow.
Down is soft and mouldable; fibre is washable and affordable; memory foam is steady and contouring; latex is springy and durable.
Adjustable pillows are a safe choice if you're unsure.
Use a protector, follow the care label and replace pillows that no longer spring back.

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Cover photo: Amin, CC BY-SA 4.0, via Wikimedia Commons