King Size Memory Foam Mattress Toppers

Browse and buy your king size memory foam mattress topper here. With something for every budget, taste and preference, we’ve found the perfect blend of affordability, quality and comfort to help create a great night’s sleep. 

From cooling comfort to spinal support - we’ve got you covered. Take a closer look at our products and what they offer. 

The highest price is £169.99

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The highest price is £169.99


  • Coolmax 5cm 50kg Memory Foam Mattress Topper


    • Coolmax Fabric
    • Removable Cover
    • Washable Cover
    • 1 Years Warranty
    • 5cm Depth
    • Hypoallergenic
    • British Made


    £89.99 £179.99

    You Save £90

  • Essentials 10cm 40kg Memory Foam Mattress Topper


    • 1 Years Warranty
    • 10cm Depth
    • Hypoallergenic
    • British Made



  • Essentials 7.5cm 40kg Memory Foam Mattress Topper


    • 1 Years Warranty
    • 7.5cm Depth
    • Hypoallergenic
    • British Made



  • Seaqual 5cm 50kg Memory Foam Mattress Topper


    • Removable Cover
    • Washable Cover
    • 1 Years Warranty
    • 5cm Depth
    • Hypoallergenic
    • British Made


    £89.99 £179.00

    You Save £89.01

Mattress Buying Guides

The right size for you

Features of Our King Size Mattress Toppers

You can find a number of exciting features in our range, including:

  • Hypoallergenic materials
  • Dust mite resistance
  • Machine washable, removable covers
  • High levels of comfort and support
  • Luxuriously soft feel

5cm Memory Foam Mattress Topper: King Size

Our 5cm memory foam toppers are our slimmest and most affordable option. The medium density foam offers comfort for the average sleeper.

7.5cm Memory Foam Bed Toppers

Level up with 7.5cm of softness - perfect if you’re looking for a little extra cushioning.

King Size Memory Foam Mattress Topper: 10cm

At 10cm, the thickest toppers in our range are perfect for heavier sleepers or those with back pain. Offering a generous layer of memory foam to minimise pressure and help you sleep.

Best King Size Mattress Toppers

To help you narrow down your selection and make the right choice for you, let’s delve into the finer details of some of our bestsellers.

Cheap King Size Mattress Toppers

No one said that achieving a great night’s sleep had to break the bank! Our Essentials 5cm memory foam mattress topper and Essentials 7.5cm topper are perfect for those trying to find comfort at affordable prices. We also offer an Essentials 10cm topper, which has a high foam depth but a low price tag.

Despite the value for money, we haven’t cut any corners when it comes to quality. Every topper in our Essentials range comes with a one-year warranty and is hypoallergenic. This makes them ideal for allergy or asthma sufferers.

King Size Cooling Mattress Toppers

Prone to getting too hot at night? We have products that can help alleviate that. Our 4G Aircool Mattress Topper is a masterpiece in innovative cooling technology, ensuring you stay cool and dry. The fabric wicks away moisture and promotes airflow while you sleep.

If that wasn’t enough, it also features a removable, machine-washable cover and a one-year warranty.

Looking for something different? Our Coolmax range is another that has been specifically designed for those who overheat at night. We offer a Coolmax 5cm topper and a Coolmax 7.5cm topper for you to choose from.

The only difference is the foam depth. Both are made from hypoallergenic materials, featuring a removable cover and a one-year warranty.

King Size Luxury Mattress Toppers

Enjoy the finer things in life? The luxurious Zen Kooltop 5cm mattress topper or Zen Kooltop 7.5cm mattress topper have found the perfect balance between functionality and comfort - offering everything from anti-allergy materials to cooling technology.

King Size Orthopedic Mattress Toppers

Suffer from aches and pains that get worse when you sleep? Orthopaedic memory foam could be the solution you’ve been waiting for. Look for high-density foam toppers to help align your spine and cushion joints.

King Size Firm Mattress Toppers

If you prefer a firmer sleep surface, look for a topper with 70kg/m3 high-density foam.

King Size Soft Mattress Toppers

Or, if you like your bed to feel soft as a cloud, a low to medium density foam should do the trick.

Thick Mattress Topper: King Size

The thickest toppers in our range feature a generous 10cm layer of foam. Our 10cm memory foam toppers are well suited to those who need extra support at night.

Why Do You Need a King Memory Foam Mattress Topper?

A topper has a number of benefits, including:


A high-quality topper will help prolong the life of your mattress. If you’ve invested in a king size memory foam mattress, it’s essential you keep it protected.

A topper can help safeguard your existing mattress from spillages and stains, a vital step to ensuring its durability.


If you don’t have a memory foam mattress already, a topper can provide an affordable alternative. You’ll receive many of the benefits without the price tag. This is great news for those on a budget.

Added Comfort

Super soft and luxurious, memory foam toppers provide an extra layer of comfort and support. This is perfect for those who suffer from any ailments or conditions, or who are looking for a soft feel.

If you have a king size bed, you’re used to the feeling of comfort and space. Why not take this even further? Everyone deserves to experience the irresistible feeling of a topper. Even the highest quality mattresses can benefit from another layer of luxury.


Toppers can help keep you cool, thanks to the airflow technology found in open-cell memory foam products. For those prone to overheating at night, this can be a welcome relief.


Memory Foam Mattress Topper Sizes

Do you have a different mattress size? We also offer:

Why Choose a King Size Foam Mattress Topper?

Memory foam is the perfect material to sleep on for a range of different reasons. These include:

  • Pressure point relief
  • Lumbar support
  • Improved circulation
  • Increased airflow
  • Neck and spine alignment
  • Stiffness relief
  • Eased muscle pain
  • Shock absorbance
  • Strain removal 

These features make it perfect for those who suffer from any particular ailments, such as arthritis. The foam itself moulds to the shape of your body, supporting your weight evenly.

King Size Memory Foam Mattress Topper Covers

A king size mattress cover is an affordable alternative to a topper, providing protection and an extra layer of comfort (however, a cover won’t be as cushioning as a topper!)


Foam Bed Toppers: Things to Consider

Bear in mind that a bed topper isn’t always the right solution. If your mattress is old, sagging or broken in some way - these are signs it’s time for a replacement. You need to ensure your bed provides high levels of support, particularly if your mattress is heavy.

Our Added Extras

At Memory Foam Warehouse, we want our customers to sleep easily in the knowledge they’re getting value for money. Not only are our products affordable, we also offer a number of other exciting extras, including:

Price Match Promise

Our mattress price match promise confirms you’ll be getting the best deals out there. So, if you find a similar product for a cheaper price, we’ll match it. This guarantees you’ll find the most competitive prices in our online store.

Free Delivery

All orders over £99 qualify for free UK delivery. This is just another way we aim to make things easy for our customers.

Customer Service

We know that sleep is a very personal experience, which makes choosing the right products important. This is why our sleep experts are always on-hand with help and advice if you need it.


Buy King Size Mattress Toppers

Ready to buy your perfect mattress topper?

Remember, a topper can only do so much. If it’s time to replace your mattress, ensure you pick correctly. There are a number of factors to take into consideration, including your sleeping position, budget and firmness preference.

At Memory Foam Warehouse, you can find everything from pocket sprung mattresses to a bed in a box. Each item is made to the highest standards, with your needs in mind.

If you like what you hear, don’t hesitate to treat yourself to the sleep you deserve. Buy a mattress online here.

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