Loft is the single most important pillow specification for spinal alignment, yet most shoppers overlook it in favour of material or brand. Loft measures the compressed height of a pillow when your head rests on it — not the fluffy height you see on a shelf. Getting loft wrong by even two centimetres can push your neck into flexion or extension, leading to morning stiffness, headaches, and disrupted sleep. Here is how to calculate your ideal loft based on your sleeping position, body dimensions, and mattress type.
What Loft Actually Measures
Manufacturers use “loft” inconsistently. Some measure uncompressed height (the pillow sitting on a flat surface with no weight). Others measure compressed height (the pillow under a head’s weight). Compressed loft is the only measurement that matters because it tells you the actual gap between your head and the mattress surface during sleep. A 15 cm uncompressed pillow might compress to 8 cm under a heavy head or 12 cm under a light head — same pillow, completely different effective loft.
Low loft pillows compress to under 8 cm. Medium loft pillows compress to 8 to 12 cm. High loft pillows compress to above 12 cm. Your target depends entirely on your sleeping position and shoulder width.
Coop Home Goods Original Adjustable Pillow
Loft by Sleeping Position
Side Sleepers
Side sleepers need the highest loft because the pillow must fill the gap between the mattress surface and the side of the head. Measure this gap by lying on your side on your mattress without a pillow and having someone measure the distance from the mattress to your ear. For most adults, the gap measures 12 to 16 cm. Broad-shouldered sleepers need 14 to 18 cm. Narrow-shouldered sleepers need 10 to 14 cm.
Memory foam and latex pillows maintain consistent loft because they resist compression predictably. Down and feather pillows lose loft overnight as the fill compresses, so side sleepers using down should choose a pillow with higher initial loft to account for compression loss.
Back Sleepers
Back sleepers need medium loft (8 to 12 cm) that fills the natural curve between the neck and mattress without pushing the head forward. Too much loft tilts the chin toward the chest, compressing the airway and straining the back of the neck. Too little loft lets the head fall backward, stretching the front of the neck.
The ideal test is to lie on your back and check whether your forehead and chin are level. If your chin is higher than your forehead, the loft is too high. If your forehead is higher than your chin, the loft is too low. Adjustable pillows let you add or remove fill until you achieve exact level positioning.
Stomach Sleepers
Stomach sleepers need the lowest loft (under 8 cm) or no pillow at all. Any significant loft forces the neck into extension (bending backward), which compresses the cervical vertebrae. A thin, soft pillow that compresses to 3 to 5 cm provides minimal cushioning without creating harmful neck angles. Some stomach sleepers place a thin pillow under their hips instead of their head to reduce lower back strain.
How Mattress Firmness Affects Loft
Your mattress changes your loft requirements because your body sinks into soft mattresses, reducing the shoulder-to-head gap. On a firm mattress, your shoulders sit on the surface with minimal sinking, creating a larger gap that needs more pillow loft. On a soft or medium mattress, your shoulders sink 2 to 5 cm into the surface, reducing the gap and requiring less pillow loft.
Side sleepers on a firm mattress typically need 14 to 18 cm loft. The same side sleeper on a plush mattress might need only 10 to 14 cm because their shoulder sinks several centimetres into the surface. Switching mattresses without adjusting pillow loft is a common cause of sudden neck pain — if you buy a new mattress, reassess your pillow too.
Loft Consistency Over Time
Different materials maintain their loft differently over months of use. Latex maintains the most consistent loft, losing less than 10% of its height over two years of use. Memory foam loses 10 to 20% of loft over two years, with cheaper foams degrading faster. Polyester and microfibre lose loft fastest, with budget options losing up to 50% of their original height within six months.
Buckwheat hull pillows maintain their loft almost indefinitely because the rigid hulls do not compress or break down. The trade-off is that buckwheat offers no cushioning softness — the loft stays consistent but the feel is firm and unyielding.
Sijo FlexCool Shredded Memory Foam Pillow
Multi-Position Sleepers
Sleepers who switch between side and back positions face a loft dilemma: side sleeping needs higher loft than back sleeping. Adjustable pillows with removable fill let you set a compromise height, typically 10 to 12 cm, that works reasonably well for both positions. Hybrid pillows with shaped contours offer different heights on different edges — you rotate the pillow to switch between a higher side-sleeping surface and a lower back-sleeping surface.
For detailed guidance on matching loft with the right firmness level, see our pillow size and loft guide. If morning neck pain persists despite adjusting loft, our neck pain guide covers additional factors like pillow shape and sleeping posture.
| Pillow | Best For | ||
|---|---|---|---|
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Coop Home Goods Original Adjustable Pillow | Best value adjustable | View |
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Sijo FlexCool Shredded Memory Foam Pillow | Best for hot sleepers | View |
Teresa created SaunaReviewer.com after discovering how transformative sauna therapy was in her own life. Today, she helps thousands of readers find reliable, honest information about saunas, accessories, and at-home wellness. Her mission is to make choosing the right sauna easier, clearer, and stress-free.
