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Is a king size extra firm mattress suitable for me?

To determine whether this is the right mattress for you, it's important that you consider the suitability of a king size mattress for your bedroom and if an extra firm mattress is compatible with your sleeping preferences.

King size mattress

Your bedroom's available space will likely determine which mattress size you opt for. A king or super king size mattress is ideal for larger bedrooms where two people share a bed; however, if you're conscious of your bedroom's size, a small double or double mattress is a suitable alternative. A simple way to assess whether your preferred mattress is a suitable fit is to measure your room and cross-reference these measurements with the dimensions of the mattress. For context, a king size mattress measures 5'0" wide and 6'6" long.

Extra firm tension

Your sleeping position is essential to determining which mattress firmness is suitable for you. A firmer mattress, either a firm or extra firm option, will solely accommodate front and back sleepers. These mattresses feature a firm surface designed to evenly distribute body weight and support sufficient spinal alignment. Firm or extra firm mattresses are unsuitable for side sleepers as, when you're sleeping in this position, a softer mattress surface is required to provide cushioned hip and shoulder support. Finally, suppose you like to interchange between side and front and back sleeping. In that case, a medium firm mattress creates the perfect balance between a soft and firm mattress surface to accommodate your sleeping preferences.

So, what is the difference between a firm and an extra firm mattress?

Whilst both mattress types support front and back sleeping, extra firm mattresses provide additional support to help alleviate any minor aches and pains, you may have heard these mattresses referred to as 'orthopaedic mattresses'. Extra firm mattresses are the firmest tension available and provide the sturdiest sleeping surface out of all of our mattresses. The best extra firm mattress will provide fantastic support without compromising comfort.

What types of extra firm mattresses does our collection comprise?

With various compositions designed to cater to all front and back sleepers, we will surely feature your perfect extra firm mattress. Please note we don't feature extra firm memory foam mattresses; however, our firm mattress collection includes memory foam options.

Open coil mattresses

The appeal of open coil mattresses is that they're considered a budget-friendly option and a fantastic choice for firm and extra firm mattresses. This mattress type consists of strong and resilient steel that's wound into coils to form the mattresses core. Open coil structures are recognised for their strong and rigid support, characteristics that are essential with any firm or extra firm mattress.

Pocket sprung mattresses

Our extra firm mattress range includes a variety of pocket sprung options. This mattress type features springs in fabric sleeves that react individually to body movements to provide targeted support and relieve pressure. Another appeal of pocket springs is their 'motion isolation' properties, ideal for anyone sharing a bed as any movements your partner makes will be restricted to their side of the bed. Regarding tailored support offerings, pocket sprung options are the best extra firm mattresses in our collection.

Natural fillings

Our extra firm mattresses featuring natural fillings are premium sleeping options offering unparalleled support and comfort. These fillings consist of cotton and wool that regulate temperature and ensure a cool and dry sleeping surface for a good night's sleep.

What mattress benefits does our collection include?

Edge support

Edge support refers to how durable and strong the mattresses borders are, allowing you to utilise the entire mattress surface without worrying about the mattress sagging.

Damask cover

A damask cover is a soft woven cover ensuring the mattresses surface is incredibly comfortable.


There's no escaping from the fact that mattresses can be difficult to manoeuvre, especially if they're required to move through hallways or up flights of stairs. With this in mind, some of our extra firm mattresses are vacuum-packed, allowing for a straightforward setup.


A range of our extra firm mattresses feature anti-allergy properties, specified under the mattress descriptions, due to the mattresses fillings and fabric.

What brands can I choose from?

Leading brands such as Silentnight, Sealy and Hypnos comprise our extensive range of king size extra firm mattresses.

Why shop with Mattressman?

With a commitment to commitment and affordability, you can rely on our collection of extra firm mattresses for a great night's sleep at an even greater price.

Free delivery

Your brand-new mattress will be with you in no time, courtesy of our free next-working-day delivery (08.00 am - 06.00 pm) for any in-stock mattress.

60-night sleep trial

It's not always easy choosing your mattress online, and with this in mind, if you purchase a mattress protector alongside your extra firm mattress, you're eligible for our 60-night sleep trial. Further details can be found on our website.

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