What is mattress firmness?
Mattress firmness describes how soft or firm a bed feels when you lie on it. While comfort is subjective, the right firmness helps keep your spine aligned and supports healthy sleep posture.
Understanding the Firmness Scale
The firmness scale runs from 1 (extremely soft) to 10 (ultra-firm), with 6.5 considered medium-firm – a balanced choice for most sleepers. Softer mattresses (3–5) offer deep cushioning, ideal for side sleepers. Medium-firm options (6–7) provide support with gentle contouring, great for back and combination sleepers. Firm mattresses (8–10) offer minimal sinkage and are best for stomach sleepers and those needing extra lift.
Soft Mattresses
Designed with plush memory foam or pillow tops, soft mattresses cradle the body for a cushioned sleep experience. These mattresses are designed to provide deep sinkage and gentle contouring. “Soft mattresses are ideal for lighter-weight sleepers and those who love a cosy, sink-in feel”, as quoted by the Cloud9 expert.
Medium-Firm Mattresses
The Cloud9 experts note that medium-firm mattresses - typically rated between 5 and 7 out of 10 - strike an ideal balance between cushioning and support, making them suitable for a broad range of sleepers. This firmness level supports back and stomach sleepers, while still providing pressure relief for side sleepers - especially those within the average weight range of 130 to 230 pounds. It’s also often recommended for combination sleepers and couples with different sleep preferences, as it offers a comfortable middle ground.
Firm Mattresses
Firm mattresses are usually made with minimal cushioning over dense foam or spring systems, offering a more lifted, less contouring feel. Cloud9 expert advises, “Firm mattresses are best for stomach sleepers and heavier individuals who need extra lift to maintain spinal alignment.” They’re excellent at preventing midsection sagging.
What is the Best Firmness for a Mattress?
There’s no single best firmness level - it depends on your sleep position, body weight, and comfort preferences. Side sleepers usually benefit from softer mattresses (typically 4-6/10) that cushion the shoulders and hips, while back and stomach sleepers need firmer surfaces (7/10 or higher) to maintain proper spinal alignment. Combination sleepers who shift positions should opt for medium-firm mattresses that offer both mobility and comfort.
How to Choose the Right Firmness
To find the right firmness, start by identifying your main sleeping position. Then take into account your body weight also. Heavier individuals often require firmer mattresses for proper alignment, while lighter sleepers tend to feel more comfortable on softer models. It’s also important to consider any physical discomfort or shared sleep preferences; those with joint pain may need plush top layers, while couples with different needs often find medium-firm options offer the best balance.
To explore our full guide to mattress firmness - including a detailed breakdown of the firmness scale, construction insights, and expert tips for choosing the right feel, visit our exclusive page - Mattress Firmness Guide.