Best Medium Firm Mattress UK – Reviews & Comparison

Last Updated on April 19, 2021


John Lewis & Partners

Our Choice




When you’re choosing a new bed, comfort and support are key features, which start with finding the right level of firmness. Firmness is more important than you might think since it can greatly influence the quality of your sleep, how your body feels and even if you wake up refreshed and well-rested or not.

But how do you choose? There are so many different mattresses, all claiming to be the bee’s knees but we all know that not all of them are great and some are simply a marketing hype without much to back it up. With such a saturated market it is getting increasingly hard to choose the one product that will be great for you and you alone

That’s why we created LightSleeper – to help you choose the product that is right for you and you alone, and help you make that choice along the way. Companies can never pay to feature their products on LightSleeper, nor we are getting paid to recommend one product over the other – we are an independent resource and we only recommend products that have passed our tests and we feel that they are the best in their category.

So let’s see what we think are the best medium firmness mattresses in the UK today and why.

1. Ergoflex 5G Mattress – Editor’s Pick

Ergoflex 5G
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First, on our list, today is the ErgoFlex 5G, an award-winning medium firm mattress, with a five-layered sleeping system that easily won the Editor’s pick in this category.

The Ergoflex 5-layer mattress is designed with premium materials, working in harmony, creating the most supportive, comfortable and pressure-relieving mattress. On top, you’ll find Ergoflex’s TENCEL® outer cover, providing a luxurious, natural and breathable surface, while the micro-fine inner cover protects the whole mattress.

Next, we have the 9cm of 5th Gen True HD ACPT™ Foam for class-leading performance and longevity, followed by Ergoflex™ 5cm Cool-Sleep™ airflow system for improved temperature regulation. Finally, we have a 9cm high resilience impact-resistant foundation layer that ensures perfectly weighted support for the upper layers and performance longevity.

Ergoflex™ 5G will contour and shape beneath you, to provide a beautifully supportive environment which will cradle your entire body, and you get to choose from six available sizes.

It’s never been easier to test Ergoflex™ for yourself, with a risk-free 30 night trial period and free next day delivery in the UK. Ergoflex is the only brand that has been in business longer than its warranty, which in this case is ten years.

We’ve selected this as our winner because it is designed to support your body, relieve pressure, disperses heat more efficiently and provide an uninterrupted night of blissful rest!

Key Features:

  • True HD Proprietary Foam
  • Cool-Sleep™ Airflow System
  • Naturally Anti-Allergenic
  • Trial Period for Returns: 30 days
  • Warranty: 10 years

​2. John Lewis Copper 1600 – Runner Up

​John Lewis & Partners Copper 1600
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The John Lewis & Partners Copper is a luxury firm mattress with a mix of traditional pocket springs and modern memory foam. It is part of their Climate Collection, designed to regulate the mattress surface temperature while you sleep at night.

This John Lewis product is a hybrid with memory foam phase-change crystals that regularly absorb, store, and release body heat. It’s also constructed with highly-conductive copper that speeds the temperature-regulating process.

John Lewis’s product is designed with a pocket spring system from 1,600 encased springs (for a king size), providing a tailored comfort level. This harder mattress is hand side stitched with a premium, quilted polyester cover.

You don’t have to turn this John Lewis’s item, but you’ll have to rotate it from head to foot end regularly. It is 25cm in depth, reassuringly dense and supportive, for those who prefer a firmer feel. John Lewis includes a seven-year warranty and a free delivery at UK mainland locations.

Overall, you will find a fantastic product in 5 different sizes with pressure-relieving properties and responsive support if you’re willing to spend some money.

Key Features:

  • 1,600 encased springs
  • Copper-infused memory foam
  • Hand side stitched
  • Quilted polyester cover
  • Warranty: 7 years

3. Silentnight 3-Zone Mattress – Worth Considering

Silentnight 3-Zone
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Silentnight is one of the UK’s top leading bedding brands, which have created an affordable and supportive option known as the 3-Zone Mattress. This is the cheapest item on today’s list, but that doesn’t mean it falls short in quality.

The Silentnight is constructed with a three zoned system that promotes maximum comfort and support. A Memory foam mattress moulds to your entire body to provide pressure-relieving support to 3 areas of your body: lower back, shoulders and hips.

Silentnight’s option has been Purotex treated to reduce moisture and dust-mite allergens, creating a budget-friendly hypo-allergenic option. You get to choose from seven available sizes with a depth of 18 cm, providing a healthier sleep.

The product comes vacuum-packed and rolled with Silentnight’s delivery team, which will take it to your room of choice, unpack, and unroll it for you. Silentnight is an innovative choice with great value that comes with a five-year guarantee, which is unheard of considering its price.

Key Features:

  • Miratex 3 zoned support system
  • Memory foam
  • Purotex treated
  • Depth: 18cm
  • Warranty: 5 years

4. Simba Hybrid Pro

Simba Hybrid Pro
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Simba is a company that has designed many sleeping products, but the Hybrid Pro mattress is one for the ages. The Hybrid Pro model is a wool mattress that comes with a massively comfortable top layer that competes for the “best wool mattress” category.

Simba’s Pro option is the top of the range coil spring mattress with over 5000 25mm titanium springs and 7 layers of comfortable excellence. Its top layer is a soft, breathable surface and the second layer is a natural wool layer on top of a patented foam open-cell Simba-Pure layer.

We also have two layers of springs in the middle, sitting on top of another high definition Simba-Pure foam layer for added edge support. You’ll get Simba’s item wrapped into a hypoallergic knitted cover, featuring four handles for ease of movement.

Simba gives you 200 days free trial period and class-leading 10-years warranty. The brand provides free shipping for most of the UK, meaning no added postage and fees.

The Simba is good for the environment too since it has no harmful chemicals, and you get to pick from four available sizes with a depth of 28cm.

Overall, the Simba Hybrid Pro is a highly recommended nontoxic mattress, suitable for most sleepers.

Key Features:

  • 7 layers of construction
  • 4 handles for ease of movement
  • Hypo-allergenic knitted cover
  • Trial Period for Returns: 200 days
  • Warranty: 10 years

5. Emma Original

Emma Original
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The Emma Original is UK’s most awarded mattress that is sure to give you the most restful and energising sleep imaginable. Emma’s products are proudly made in the United Kingdom and undergo strict testing to assure they meet the highest quality standards.

The Emma mattress is constructed from four innovative layers. First, we have a temperature-regulating top and bottom cover that keeps moisture away and has non-slip elements, followed by an innovative Airgocell foam that keeps air flowing so your body can stay cool.

After that, we have the pressure-relieving visco-elastic memory foam, contouring to your body and distributing pressure evenly across the whole surface. Last is the supportive HRX foam providing the necessary counter pressure to keep your spine aligned and supporting your back.

You get to pick from five different sizes with a depth of 25cm and discover what it means to wake up feeling genuinely epic. Emma gives you a 200-day trial period for your body to adjust to the new mattress and ten blissful years of guaranteed quality!

Key Features:

  • Three layers of construction
  • Seven zone back structure
  • Innovative Airgocell® regulates temperature
  • Trial Period for Returns: 200 days
  • Warranty: 10 years

How to choose а medium firm mattress?

How to choose the best medium-firm mattress for your needs?

Medium-firm products are the most popular option on the market, which is why there are numerous brands and models. However, not all of them will get the job done. Here are some factors you have to consider to find yourself a high-quality medium mattress:

Type & Materials

The type of mattress and the materials its build from should be essential to your choice making. You can find a blend of firmness in hybrids, memory foam, latex and innerspring products. All four suggestions will can provide the perfect firmness. Think about your body weight, sleeping position and personal preferences when deciding on type and materials.


One of your best options in knowing if a product is made from high-quality materials are third-party certifications, which have met stringent quality standards for safety. The most common ones are CertiPUR® and OEKO-TEX®.

How to choose firmness


Consider the importance of features like motion isolation, temperature regulation, edge support, and off-gassing. If you share the bed with someone, you will need to find an item with good isolating capabilities, and if you tend to sleep hot, then look for a mattress with cooling properties.


Firmness ratings can vary from brand to brand, but generally, they will be in the 1 to 10 range, in which you will want to find yourself between 5 to 7 on the scale.

Home Trial & Warranty

Laying on a bed for 10 minutes in a store, won’t tell you if this is the right choice for you. That’s why you should opt for options that come with a home trial period and warranty. This way, it will be way easier for you to return or exchange it if necessary.

Why choose a medium-firm mattress?

Why choose a medium-firm mattress?

In general, most people consider firmer mattresses as a better option compared to soft ones. This isn’t necessarily true every time.

Before you decide on a product’s firmness, think about your body weight, sleeping position, the type of bed you want and what materials it should be constructed from. If the quality of an item is poor, the firmness won’t matter.

At the end of the day, you need an option that will relieve your pressure while providing you with comfort and support, and a medium-firm product will bring you a balance between all three. In most situations, a medium-firm mattress will ensure that your spine remains in its optimal alignment while providing you with a refreshing nights sleep.

If you’re struggling with pressure in your joints, or have any chronic pains, this option may be quite beneficial for you.

Who is a medium-firm mattress suitable for?

Who is a medium-firm mattress suitable for?

Medium-firm mattresses are suitable for a wide variety of people and body types. They can provide you with the need support whether you’re shorter, taller, skinnier, or heavier build. Also, they are suited for all sleeping positions, leaving only your personal preference.

Ultimately, we consider them the one for all option. However, sometimes individual preferences can vary. Therefore, you can choose a firm mattress of a softer one.

Final Words

With plenty of support and comfort, medium-firm mattresses are a popular choice for a reason. With that said, make sure you know what you’re buying. Read as much as you can and do some research so that you can make an informed decision.

Think about what a company offers, and look into the features and qualities of a product thoroughly. Mattress brands frequently change, and so do the products they offer, which is why we will continue to provide you with the most up to par information and try to shed some light on the best medium-firm mattress on the market.

If there are any questions, regarding the subject that were left unanswered, we would gladly answer them in the comments below.

Isabelle Harris
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