Pillow Firmness & Loft Guide: Side, Back & Front Sleepers

Choosing the right pillow is not only about whether it feels soft or firm. Pillow height, also called loft, can be just as important because it affects how high your head rests above the mattress.

This guide explains pillow firmness and loft, how they differ, and how sleeping position, shoulder width, mattress firmness and filling type can influence which pillow feels most comfortable.

What Does Pillow Firmness Mean?

Pillow firmness describes how resistant a pillow feels when pressure is applied. A softer pillow compresses more easily, while a firmer pillow keeps more of its shape under the weight of your head.

Firmness is influenced by several factors, including the filling material, filling quantity, internal construction and how easily the pillow compresses.

A pillow labelled firm may still have a relatively low height, while a soft pillow can still be quite deep. This is why firmness and loft should be considered separately.

What Is Pillow Loft?

Pillow loft refers to the height or thickness of a pillow. It is usually considered as low, medium or high, although manufacturers may use different descriptions or measurements.

Loft affects how far your head is raised from the mattress. A high-loft pillow creates more height, while a low-loft pillow keeps the head closer to the mattress surface.

The amount of usable loft can also change once you lie on the pillow because softer fillings may compress significantly.

Pillow Firmness vs Pillow Loft: What’s the Difference?

Firmness and loft are related, but they are not the same thing.

• Firmness describes how much resistance the pillow provides when compressed.
• Loft describes how high or thick the pillow is.

For example, a high-loft feather pillow may compress considerably during use, while a lower-profile memory foam pillow may feel firmer and maintain more of its original shape.

When comparing pillows, check both the height and the filling construction rather than relying only on labels such as soft, medium or firm.

Soft, Medium or Firm Pillow: Which Should You Choose?

There is no single firmness level that is best for everyone. Comfort depends on how much compression you prefer, your sleeping position, the pillow filling and how the pillow works with your mattress.

Soft Pillows

Soft pillows compress more easily and can create a more cushioned sleeping surface.

They may appeal to people who prefer a less structured feel or who like a pillow that can be shaped and adjusted during the night.

However, a very soft pillow may lose a significant amount of height once compressed, so its starting loft should also be considered.

Medium-Firm Pillows

Medium-firm pillows sit between soft and firm options and can provide a balance between cushioning and shape retention.

This type of pillow may suit sleepers who want some compression without the pillow becoming too flat during use.

Firm Pillows

Firm pillows resist compression more strongly and tend to maintain more of their structure under pressure.

They can appeal to sleepers who prefer a more supportive or stable surface, but firmness alone does not determine whether a pillow will feel comfortable.

A pillow that is too firm for your preference may feel overly rigid, especially if it also has a high loft.

Low, Medium and High-Loft Pillows Explained

Low-Loft Pillows

Low-loft pillows have a shallower profile and keep the head closer to the mattress.

They are often considered by front sleepers or people who simply prefer less elevation, although the best height still depends on individual comfort and mattress characteristics.

Medium-Loft Pillows

Medium-loft pillows provide a moderate amount of height and are commonly chosen by people looking for a balanced profile.

They can work across different sleeping positions depending on their firmness and how much they compress during use.

High-Loft Pillows

High-loft pillows provide more height above the mattress.

They may suit some side sleepers, especially those with broader shoulders or those sleeping on a firmer mattress, but high loft is not automatically better.

The actual sleeping height depends on how much the pillow compresses once weight is applied.

What Pillow Loft Is Best for Side Sleepers?

Side sleepers often prefer more pillow height than front sleepers because there is more space between the head and the mattress when lying on the side.

However, the right loft can vary considerably from person to person.

Shoulder Width Matters

People with broader shoulders may prefer more pillow height because the head sits further away from the mattress when sleeping on the side.

Someone with narrower shoulders may find the same high-loft pillow too elevated.

Mattress Firmness Matters Too

A softer mattress allows the shoulder and upper body to sink further into the mattress, which can reduce the amount of pillow height needed.

A firmer mattress usually allows less shoulder sink, so some side sleepers may prefer a higher-loft pillow.

The combination of shoulder width, mattress firmness and pillow compression is therefore more useful than choosing by sleeping position alone.

What Pillow Firmness Is Best for Side Sleepers?

Some side sleepers prefer medium-firm or firm pillows because these options may maintain more of their height during use.

However, a softer pillow can also work if it starts with sufficient loft and does not compress more than the sleeper prefers.

The most important factors are the finished sleeping height, overall comfort and how stable the pillow feels throughout the night.

What Pillow Loft Is Best for Back Sleepers?

Back sleepers often prefer a moderate pillow height rather than an extremely high profile.

A very high pillow can feel excessive for some back sleepers, while a very low pillow may not provide the amount of elevation they prefer.

Medium loft is therefore a common starting point, but individual preference and mattress firmness still matter.

What Pillow Firmness Is Best for Back Sleepers?

Back sleepers may prefer a pillow that offers enough structure to hold its shape without feeling excessively rigid.

Soft, medium and firm pillows can all work depending on their loft and filling construction.

For example, a medium-firm memory foam pillow may feel very different from a medium-firm feather pillow because the two materials compress and respond to pressure differently.

What Pillow Loft Is Best for Front Sleepers?

Front sleepers often prefer a lower-profile pillow because the head is already relatively close to the mattress when lying face down.

A high or highly structured pillow may feel too elevated for some front sleepers.

If you mainly sleep on your front, compare lower-loft options and pay close attention to how much the pillow compresses during use.

What Pillow Firmness Is Best for Front Sleepers?

Some front sleepers prefer a softer or more compressible pillow because it creates less elevation once weight is applied.

However, firmness should not be considered in isolation. A soft but very high pillow may still create more height than a firmer, lower-profile design.

Always consider firmness and loft together.

How Mattress Firmness Affects Pillow Choice

Your mattress influences how far your shoulders and upper body sink during sleep, which changes how much pillow height may feel comfortable.

On a softer mattress, the body usually sinks further into the surface. This can reduce the distance between the head and mattress.

On a firmer mattress, there is generally less sink, so some sleepers may prefer slightly more pillow height.

This is one reason the same pillow can feel very different on two different beds.

How Pillow Filling Affects Firmness and Loft

Memory Foam Pillows

Memory foam pillows tend to provide a more structured shape than loose-fill pillows.

Some memory foam designs maintain their profile relatively consistently, while others use softer or shredded foam that allows greater compression and adjustment.

If you want a more detailed explanation, read our Memory Foam Pillow Guide.

You can also compare the Stoftly Bamboo Memory Foam Pillow and Stoftly Airflow Cooling Memory Foam Pillow for two different memory foam constructions.

Feather Pillows

Feather pillows are generally more mouldable than solid memory foam and can be plumped or shaped to change how the filling is distributed.

They may start with a generous loft but compress significantly once weight is applied.

If you are comparing natural fillings, see our Duck vs Goose Feather Pillows guide.

Hollowfibre and Hotel-Style Pillows

Hollowfibre and hotel-style pillows are available in a wide range of firmness and loft levels.

Some are soft and compressible, while others use more filling to create a fuller, firmer profile.

For a broader look at hotel-style pillow construction, read our How to Choose Hotel Pillows in the UK guide.

How to Choose the Right Pillow Height

Rather than choosing a pillow only by sleeping position, consider the following factors together:

• Your usual sleeping position.
• Your shoulder width.
• Your mattress firmness.
• How much the pillow compresses under weight.
• Your preferred sleeping height.
• The dimensions and shape of the pillow.

If possible, compare the pillow's stated dimensions with a pillow you already find comfortable.

Remember that two pillows with the same listed height can feel different if one compresses much more than the other.

How to Choose the Right Pillow Firmness

Start by thinking about how you prefer a pillow to respond when you lie on it.

If you like a pillow that compresses and can be reshaped easily, a softer option may suit you.

If you prefer more resistance and a pillow that maintains its structure, a medium-firm or firm option may be more appealing.

The filling type matters too. Firmness labels are not standardised across every manufacturer, so compare the product description, construction and filling rather than relying on the word “firm” alone.

When Should You Replace Your Pillow?

There is no fixed replacement date that applies to every pillow because durability depends on the filling, construction, frequency of use and care.

Consider replacing a pillow when:

• It no longer returns towards its intended shape.
• It has become permanently flattened or misshapen.
• The filling has developed persistent clumps.
• The outer casing shows significant deterioration.
• The pillow no longer feels comfortable for you.

A pillow that has lost too much loft may feel very different from when it was new, even if the original firmness rating has not changed.

Which Pillow Type Might Suit You?

If you prefer a structured, shape-retaining feel, a memory foam pillow may be worth considering.

The Stoftly Bamboo Memory Foam Pillow combines memory foam with a bamboo-derived outer cover, while the Stoftly Airflow Cooling Memory Foam Pillow uses an airflow-focused construction.

If you prefer a more mouldable natural filling, feather pillows may be more suitable. Our Duck vs Goose Feather Pillows guide explains the main differences.

If you are still comparing styles, browse the full Stoftly pillow collection to compare memory foam, feather and hotel-style options.

You can also read our Are Bamboo Pillows Good? guide if you are considering a bamboo-covered memory foam pillow.