The Complete Guide to Mattress Firmness Levels

Choosing a mattress often starts with one simple question: how firm should it be? Yet mattress firmness is one of the most misunderstood parts of buying a bed. What feels comfortable to one person can feel completely wrong to another. 

There’s no universal “best” firmness level. The right choice depends on your body weight, sleeping position and personal comfort preferences. This guide breaks down mattress firmness levels in simple terms, helping you understand what they mean and how to choose a mattress that genuinely suits your sleep habits. 

What does mattress firmness actually mean?

Mattress firmness refers to how soft or firm a mattress feels when you lie on it. It describes the initial comfort sensation rather than how well the mattress supports your body over time. 

Firmness is often confused with support, but they are not the same thing. A mattress can feel soft while still offering excellent support, and a firm mattress can still cause discomfort if it doesn’t suit your body. 

Most mattresses are rated on a firmness scale that ranges from very soft to firm, giving shoppers a general guide to how the mattress will feel. 

The mattress firmness scale explained 

Very soft

Very soft mattresses allow deep sink-in and provide a plush, cushioning feel. They are less common and typically suit people who prefer a very enveloping sleep surface. 

Soft

Soft mattresses gently contour to the body and relieve pressure points, especially around the hips and shoulders. They offer a cosy feel without excessive sinking for most sleepers. 

Medium

Medium mattresses balance softness and firmness. They provide light contouring while still maintaining surface stability, making them a popular all-round choice. 

Medium-firm

Medium-firm mattresses feel supportive with moderate cushioning. They offer pressure relief without too much sink-in and are often recommended for a wide range of sleepers. 

Firm

Firm mattresses provide a solid, supportive feel with minimal cushioning. They keep the body lifted and reduce sinking, particularly beneficial for some back and stomach sleepers. 

Who is a soft mattress best for?

Soft mattresses are often best suited to side sleepers who need pressure relief around the shoulders and hips. 

The main advantage is comfort and contouring, which can reduce pressure points. However, soft mattresses may lack sufficient surface stability for heavier sleepers or those who move frequently during the night. 

Who is a medium or medium-firm mattress best for?

Medium and medium-firm mattresses suit the widest range of sleepers, including back sleepers and combination sleepers. 

They offer a good balance of comfort and support, adapting to different body shapes while maintaining spinal alignment. The downside is that they may feel slightly too firm for those who prefer a very plush surface or too soft for sleepers who like a very solid feel. 

Who is a firm mattress best for? 

Firm mattresses are commonly chosen by back and stomach sleepers who need extra support to keep the spine aligned. 

They prevent excessive sinking and can feel more stable. However, firm mattresses may feel uncomfortable for side sleepers, particularly if they don’t provide enough cushioning at pressure points. 

Does mattress material affect firmness?

Yes, mattress materials play a significant role in how firmness feels. 

Memory foam mattresses tend to contour closely to the body, often feeling softer than their firmness rating suggests. Pocket spring mattresses provide a more traditional feel with responsive support and less sink-in. Hybrid mattresses combine foam and springs, offering a balance of cushioning and stability. 

The same firmness level can feel different depending on the materials used, which is why material choice matters alongside firmness. 

Firmness vs support

A common misconception is that a firmer mattress always provides better support. In reality, support is about how well a mattress keeps your spine aligned and distributes body weight evenly. 

A mattress that is too firm or too soft for your body can both cause poor support. The best mattress is one that matches your firmness preference while still supporting your natural sleeping posture. 

How to choose the right firmness level 

Choosing the right firmness involves considering several factors, including sleeping position, health needs and personal comfort preferences. Your bed base can also influence how firm a mattress feels. 

Taking time to understand your needs can help you make a more confident decision. At My Divan Bed, our range of mattresses includes a variety of firmness levels designed to suit different sleep styles, making it easier to find a mattress that supports comfortable, restful sleep night after night.