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Firm Mattresses

Specially designed to evenly distribute your weight as you sleep, firm mattresses are perfectly suited to help alleviate any back, neck, shoulder, and hip pain you might be experiencing. Although the softness of a medium mattress can certainly be comforting, sometimes our bodies need that little bit of extra support throughout the night for an uninterrupted rest. And if this sounds familiar, then a firm mattress might be just what you're looking for. Take a look at our filterable range below or head to the bottom for more details about firm mattresses.

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Based on 23,378 reviews

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We were kept updated all the way through from purchase right up until delivery which was very helpful.

Linda Rudd 11th Jul
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From ordering to delivery they were very good. Ordering offices very easy, delivery very quick and delivery company very efficient and careful.

Anita B 9th Jul
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So far so good with the mattress, the quality is excellent and is as described. First class speedy delivery service received and would not hesitate to recommend.

Vicki 9th Jul

Help & Buying Guides

What are the different types of firm mattresses?

Firm mattresses come in a range of different types to suit all sleepers:

  • Memory foam

  • Pocket sprung

  • Miracoil™

  • Traditional sprung 

  • Natural fillings

  • Geltex

Whether you’re a front, side or back sleeper, prefer a more responsive feel or need to stop your partner’s night-time wriggling from disturbing your sleep, you can choose from a huge selection of firmer options here at MattressNextDay.

Memory foam

Designed for NASA’s space program, memory foam is incredibly supportive and comfortable. It moulds to the shape of your body, minimising pressure points and cradling your body for all-night comfort. Firm memory foam mattresses are usually single-sided, so they’re easy to look after, too.

Pocket sprung

A matrix of high-tensile steel springs sits in individual fabric pockets to create one of the best firm mattresses available. Each spring can act independently as well as respond to its neighbours, so movement transference is minimised. Incredibly comfortable and long-lasting.


Exclusive to Silentnight, this unique system is designed to provide outstanding support with no roll-together or movement transference. Particularly suitable for front sleepers, these mattresses are top-quality options with plenty of extra comfort features.

Traditional sprung 

Using a matrix of interconnected springs, traditional sprung firm mattresses are a great budget option that provides good levels of comfort and support. They’re ideal if you want to replace a guest bed mattress and can be combined with mattress toppers for extra comfort.

Natural fillings

Using fillings such as pure wool, bamboo, and cotton, these mattresses are often naturally hypoallergenic. This makes them ideal for people who suffer from allergies or respiratory conditions as they create a healthier sleeping environment with fewer allergens.

Cooling gel and Geltex

One issue with memory foam mattresses is that they can often feel a little on the warm side. Cooling mattresses such as Geltex mattresses include a gel layer that keeps the sleeping area cooler and fresher, making them perfect for sleepers who suffer from night sweats or hot flushes.

Is a firm mattress good for your back?

Thinking about investing in a new mattress for back pain? It is recommended to select a firm mattress to help combat pain in your back or spine when you sleep. If your mattress is too soft and unsupportive, you can sink into it too deeply which can cause your back to curve.

If your surface is too hard, though, you can put too much pressure on different parts of your body, leading to aches, pains and stiffness. A decent firm mattress can prevent your spine from arching as you sleep, helping you to keep a healthy alignment and avoid back pain, stiffness and other bodily aches.

Why should I buy a firm mattress?

Firm mattresses are ideal if you like sleeping on your back or your stomach, this kind of mattress can support your weight without causing pain to pressure points, such as your heels, toes, buttocks, ribcage, elbows, shoulders, and head.

Comfort is a very subjective area and what might be the right resistance for one person may be completely wrong for another so it’s important to know what kind of tension suits you before you buy.

Do firm mattresses last longer?

Firm mattresses are just like any other mattress in that they last for approximately eight years before you need to start thinking about replacing your old mattress. We advise that single-sided mattresses (often those made from memory foam) are rotated from head to foot every six months or so to avoid dips, lumps, and bumps from forming - read our guide to turning and rotating your mattress for more help.

For double-sided mattresses, flipping and turning every few months will achieve the same effect, prolonging the life of your mattress and preventing those uncomfortable lumps from forming. The firmness rating of a mattress will not have any direct influence on how long it lasts.

What are the benefits of a firm mattress?

When using a firm mattress, you are helping your body to sleep peacefully each night with the correct alignment. If you have been bending during the day or sitting for long periods, after a hard day's work the stability that a firm mattress supplies will help greatly in reducing any pain you may currently feel.

Many hotels have firm mattresses throughout their rooms. Some hotels add an extra element of comfort and luxury by adding a firm memory foam mattress topper on top of the mattress. This also helps prolong the life of a mattress as well as providing an extra level of support.

Is next-day delivery available?

With our 24-hour free delivery, your perfect firm mattresses can be at your doorstep as soon as possible. Browse our wide online selection today to explore options that are all handmade in the UK and offer the above benefits. Find out more by contacting our team who will answer any questions you may have.

If you need help choosing the right mattress firmness for you, check out our Mattress Buying Guide for tips and tricks on how to choose the best type of mattress for you.

Size Imperial Metric
Cot Mattress 3'9" x 1'9" 120cm x 60cm
Cot Bed Mattress 4'6" x 2'3" 140cm x 70cm
Adjustable Small Single 2'6" x 6'6" 75cm x 200cm
Adjustable Single 3' x 6'6" 90cm x 200cm
Adjustable Small Double 4' x 6'6" 120cm x 200cm
Adjustable Double 4'6" x 6'6" 135cm x 200cm
Small Single 2'6" x 6'3" 75cm x 190cm
Single 3' x 6'3" 90cm x 190cm
Small Double 4' x 6'3" 120cm x 190cm
Double 4'6" x 6'3" 135cm x 190cm
King Size 5' x 6'6" 150cm x 200cm
Super King 6' x 6'6" 180cm x 200cm
European Small Single 2'8" x 6'6" 80cm x 200cm
European Single 3' x 6'6" 90cm x 200cm
European Double 4'7" x 6'6" 140cm x 200cm
European King Size 5'3" x 6'6" 160cm x 200cm

All mattress sizes given are approximate and stated sizes refer to the sleeping surface only. Mattresses sizes may vary slightly from their stated dimensions due to manufacturing tolerances, please allow +/- 2 inches (5cm).

Support Best for
 Icon for Memory Foam Memory Foam Body moulding and pressure relieving
 Icon for Natural Fibres Natural Fibres Unrivalled comfort, naturally temperature-regulating
 Icon for Latex Latex Breathable, supportive and eco friendly
 Icon for Cool Gel Memory Foam Cool Gel Memory Foam Active cooling properties, ideal for hot sleepers
 Icon for Soft White Fibres Soft White Fibres Hypoallergenic polyester, soft and durable

Support Best for
 Icon for Pocket Springs Pocket Springs Individual springs for tailored support
 Icon for Foam Foam Conforms to your body's shape, silent (no springs)
 Icon for Open Coil Springs Open Coil Springs Traditional, interlinked springs
 Icon for Pocket Springs Latex Bouncy yet supportive, great for hot sleepers

Firmness Best for
Good for side sleepers, a softer level of support
Good all-rounder for front, side or back sleepers
Medium - Firm
Good for people who change sleeping position
Good for people who sleep on their front or back
Extra Firm
The firmest level of support, also known as orthopaedic

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