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Firm Mattresses

If you’re looking for extra support in bed, our range of firm mattresses is worth exploring. We offer firm mattresses in many different sizes, from firm single mattresses to super king size, each with unique benefits and features ensuring that you can find the best mattress to suit your sleeping needs. Browse our collection below.

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Based on 22,124 reviews

Trustpilot Star rating Verified

It was very easy to order, with great prices. Delivery was quick, received text and was called before delivery on timings. Great service and would recommend mattress nextday.

Jc 11th Apr
Trustpilot Star rating Verified

I have used this company in the past and I am never dissapointed. Beautiful mattress arrived promptly and delivered by polite and courteous delivery drivers. My mattress was even better than I expected for the price I paid. Would recommend this company very highly.

Mrs D From Cambridge 11th Apr
Trustpilot Star rating Verified

Perfect experience. Sitting at home on a saturday optimistically googling fast delivery mattress and mattressnextday popped up. A zip and link superking size isnt the easiest thing to find quickly. 8am on monday two nice gents took away my old one and delivered a really nice sleepezee firm mattress on time and with no fuss. Just a big thank you for such a unique company when everyone else was 1-6 weeks.

Mr C Roberts 11th Apr

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