Almost every travel pillow is sold in one size. Almost every review of one contains someone saying it was too big, and someone else saying it was too small.
Both are usually right. Adult neck circumference ranges from roughly 30cm to nearly 50cm, and the vertical gap the pillow has to fill varies just as much. A pillow built around the middle of that range will be wrong for a lot of people at either end — and “it didn't work for me” gets blamed on the pillow rather than the fit.
Two measurements sort this out. Both take about a minute.
Measurement 1: your neck circumference
This decides whether the pillow will close properly around you, or sit loose and slide.
Take a soft tape measure and wrap it around the base of your neck, where a shirt collar would sit — not up under your jaw. Keep it snug but not tight; you should be able to slide a finger under it.
If you don't have a soft tape, use a phone charging cable or a strip of paper, mark where it meets, then measure that against a ruler.
Rough guide:
| Neck circumference | What to look for |
|---|---|
| Under 33cm | Fixed-size pillows will likely sit loose. Prioritise adjustable closures. |
| 33–42cm | Most fixed-size pillows will fit. |
| 42–48cm | Check the maximum before buying. Many pillows won't close. |
| Over 48cm | Adjustable only. |
This is why adjustability isn't a minor feature. A pillow that specifies a range — the AeroWrap™, for example, is built to fit necks from 32 to 48cm — is telling you something a pillow with no stated size isn't.
Measurement 2: your shoulder-to-jaw gap
This is the one almost nobody measures, and it matters more than circumference.
It's the vertical distance your head has to fall before something catches it. Sit upright in a firm chair, look straight ahead, and measure from the top of your shoulder to the bottom of your jawbone, directly below your ear.
Most adults land between 9 and 15cm.
What the number means:
- Pillow shorter than your gap: your head drops, gathers momentum, then hits the pillow. You get the jolt anyway. This is the most common complaint and it reads as “the pillow does nothing.”
- Pillow taller than your gap: your head is pushed up and your neck is compressed from below. Feels fine for ten minutes, aches after two hours.
- Pillow roughly matching your gap: your head is supported from the moment your muscles let go. Nothing to drop through.
Long necks and narrow shoulders need more height than the average pillow provides. Short necks and broad shoulders need less. If you've bought two travel pillows and hated both in different ways, this is very likely why.
The third thing, which isn't a measurement
Where do you actually sleep on a plane?
- Window seat, leaning on the wall: you have external support on one side. Side height matters less; forward support still matters.
- Aisle or middle seat, upright: nothing external to lean on. You need the pillow to do all of it — sides and front.
- Head-forward sleeper: front support is the only thing that will help you. Side height is close to irrelevant.
The seat you usually book should change what you buy. Most people never make that connection.
How to test a pillow you already own
Before you replace it, check whether the one in your cupboard is actually the wrong size or just badly worn.
Sit upright somewhere with no headrest. Put the pillow on. Close your eyes and deliberately go completely limp — neck included.
- Head drops forward more than a couple of centimetres: no effective front support. Size isn't the problem; shape is.
- Head tips sideways to the shoulder: sides are too low for your gap.
- Head is pushed up and your chin lifts: pillow is too tall for you.
- Head barely moves: the pillow fits. If you're still sleeping badly, the problem is light, temperature or seat choice, not support.
Common sizing mistakes
Buying by how it feels in your hands. Plushness in a shop tells you nothing about behaviour under 5kg of skull for six hours.
Assuming bigger means more support. An oversized pillow forces your head into extension and compresses the back of your neck. Bigger is a different failure, not a safer one.
Ignoring packed size. A pillow that fits your neck perfectly but won't fit in your bag is a pillow that stays home. If you travel carry-on only, check the packed dimensions — the Lunara™ PackFold, at 22 × 20 × 12cm folded, exists specifically because of this.
Buying for the flight you wish you took. If you fly economy in a middle seat, don't buy the pillow that works in a window seat.
Quick reference
Write these two numbers in your phone before you shop:
- Neck circumference — measured at the collar line
- Shoulder-to-jaw gap — measured sitting upright, below the ear
Then check any pillow you're considering against both. If the listing doesn't state a size range, that's information too.
Two minutes with a tape measure prevents the most common travel-pillow disappointment there is — and it's the step that almost every buying guide, including most of ours, has skipped.
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