Choosing a pillow for side sleeping is less about finding the softest or most expensive option and more about finding the right combination of height, shape and support for your body and mattress. A pillow that feels comfortable for one person can feel completely wrong for another because shoulder width, mattress firmness and sleeping habits all change how much space the pillow needs to fill.
If you sleep mostly on your side, the main job of your pillow is to fill the space between your head and the mattress without pushing your head too far up or letting it drop too far down. The goal is a comfortable, neutral sleeping position that feels natural rather than forced.
Start with pillow height, also called loft
Loft is one of the most important factors for side sleepers. Because your shoulder creates distance between your head and the mattress, side sleepers often need more height than back sleepers. A pillow that is too low can leave your head angled down towards the mattress, while a pillow that is too high can tilt it in the opposite direction.
Your ideal loft depends on several things. Broader shoulders usually create a larger gap to fill. A soft mattress allows your shoulder to sink further into the bed, so you may need less pillow height. A firmer mattress keeps your shoulder higher, which can increase the amount of space between your head and the mattress.
A useful way to judge loft is to look at your position once you are lying naturally on your side. Your head should feel supported without being noticeably pushed upwards. If you constantly fold the pillow, place your arm underneath it or stack another pillow on top, that can be a sign that your current pillow is not matching the height you prefer.
Think about firmness, not just softness
A pillow can feel plush while still being supportive. For side sleeping, the important question is whether the pillow holds its shape well enough once the weight of your head is on it. Very soft pillows may compress substantially during the night, while very firm pillows can feel less forgiving around the face and shoulder.
Many people prefer something in the middle, with enough give to feel comfortable and enough structure to avoid flattening immediately. Memory foam and other shaped foams are popular for this reason because they are designed to maintain a more consistent profile than a loose fill pillow.
Consider whether a contoured shape suits you
Traditional pillows use a mostly flat or gently rounded surface. Contoured pillows add raised and lowered areas to guide where the head and neck sit. Some also include shoulder cut outs, side sleeping zones or a central cradle.
A contoured design can be useful if you like a pillow that feels more structured and stays in a predictable shape through the night. It may be less suitable if you constantly scrunch, fold or reshape your pillow because the structure is intentionally more fixed.
Our Butterfly Deep Support Pillow, for example, uses a sculpted shape with different support areas rather than a completely flat surface. It is designed for people who prefer a more defined sleep setup for side and back sleeping.
Match the pillow to your mattress
Your mattress affects your pillow choice more than many people realise. On a soft mattress, the shoulder and torso sink deeper, effectively bringing the head closer to the mattress surface. On a firm mattress, the shoulder stays higher, so the gap under the head may be larger.
This is why copying someone else's pillow choice based only on their sleeping position is not always helpful. A side sleeper on a plush mattress may prefer a lower pillow than a side sleeper with the same build on a very firm mattress.
Do not ignore your usual sleeping habits
Very few people stay in exactly one position all night. If you start on your side but often wake on your back, a pillow that can accommodate both positions may make more sense than an extreme high loft pillow designed only for side sleeping.
Think about what you actually do, not just the position you fall asleep in. If you rotate between side and back sleeping, look for a design that gives you enough height on your side while still providing a comfortable central area when you roll onto your back.
Materials affect feel and maintenance
Pillow materials change how a pillow responds during the night. Memory foam tends to offer a more structured shape. Fibre fill can feel softer and more traditional. Latex often feels springier and more responsive. Adjustable fill pillows allow material to be removed or added, which can be useful if you are unsure about ideal loft.
Also consider practical details such as a removable cover, cleaning instructions, breathability and whether the pillow holds its shape after repeated use. These everyday factors often matter more over time than a long list of technical features.
Give yourself time to judge a new pillow
A new pillow can feel unfamiliar simply because it changes a setup you have used for months or years. That does not mean you should ignore obvious discomfort, but it can take a few nights to work out whether the height and shape genuinely suit you.
Pay attention to whether you are constantly repositioning it, whether you feel tempted to add another pillow, and whether you naturally settle into your usual sleeping position. Those signals are often more useful than how the pillow feels during a thirty second test.
A simple side sleeper checklist
- Choose enough loft to fill the space created by your shoulder.
- Consider your shoulder width and mattress firmness together.
- Look for a pillow that keeps its shape at the firmness level you prefer.
- Decide whether you prefer a traditional surface or a contoured design.
- Account for back sleeping if you regularly change positions overnight.
- Check cover, care and material details before buying.
If you want to compare supportive sleep and upper body comfort options, you can also browse our Neck & Upper Back Wellness collection.
Frequently asked questions
Should side sleepers use a high pillow?
Side sleepers often need more height than back sleepers, but there is no single correct height. Shoulder width, mattress firmness and how much the pillow compresses all matter.
Is memory foam good for side sleeping?
Memory foam can suit side sleepers who prefer a structured pillow that maintains a consistent shape. The right choice still depends on loft, firmness and personal preference.
What if I sleep on both my side and back?
Look for a pillow that can accommodate both positions rather than choosing the tallest side sleeper pillow available. A contoured design with different support zones may be worth considering.
How do I know if my pillow is too low?
Common signs include repeatedly folding it, placing an arm underneath it or wanting to add another pillow. The most useful test is whether your head feels comfortably supported in your normal sleeping position.
