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Protect your products
5-Year Accident Cover £22

We know how important it is to keep your new sleep products safe, but we also know accidents can happen. With Accident Cover, we’ll help you keep your bed and/or mattress in their very best condition.

We are paid by the insurer through commission, which is included in the premium you pay.

So what is covered?
  • Food and drink spills such as coffee or red wine
  • Ink marks from biros, permanent markers etc
  • Make-up and cosmetic stains
  • Accidental damage caused by pets
  • Burns from heated appliances such as straighteners or curlers
  • Rips and tears
  • Damage causing breakage to the frame
What is not insured?
  • Deliberate damage caused by you or any person
  • General wear and tear
  • Accumulation of damage or staining
  • Any structural or manufacturing defects
  • Accidental staining or damage caused by the use of incorrect cleaning products
Subtotal
Pay Now: , sale price: £0.00 OR Payments from: £0.00 per month
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Goes like a dream

WHY NOT TRY OUR AWARD-WINNING SLEEP TECH?

Free pillows, duvet & more worth up to £836‡

Ends 25/05/2026, offer excludes refurbished mattresses and cannot be used in conjunction with other offers/promotions, and is subject to our Terms.

Hybrid® Essential mattress receives two† AeroDown pillows.
Hybrid® & Source mattress receives two† Hybrid™ pillows plus a Quilted Performance mattress protector‡.
Hybrid Pro® & Escape mattress receives two† Hybrid™ pillows plus a Hybrid™ duvet and a Quilted Performance mattress protector‡.
Hybrid® Luxe, Hybrid® Ultra, & Apex mattress receives two† Hybrid™ pillows plus a Hybrid™ 3-in-1 duvet, and a Quilted Performance mattress protector.‡

†Except Single size mattresses (receive one pillow).
‡ Mattress protector and duvet/s in size matching the mattress purchase.

King Size Mattress Toppers

Is your current king-size mattress not providing you with the level of comfort and support that you expect? Or perhaps it’s not so great at regulating your body temperature at night? Whatever the case might be, a king-sized mattress topper from Simba can help.

All our king-size mattress toppers feature Simba’s unique award-winning mattress technology that can make your current mattress feel cooler, more supportive, and comfortable to sleep on from the very first night.

So, browse through our collection of king-size mattress toppers, choose the one that best suits your needs, and we’ll deliver it right to your doorstep the very next day, completely free of charge.

Hybrid® Mattress Topper

Ultimate Sleep Upgrade

Hybrid® Mattress Topper

  • 4 Layers

  • 2500 Springs

  • 6.5cm Depth

King £399
Or £10.72 monthly*
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Hybrid® Essential Mattress Topper
  • 4 Layers

  • 1500 Springs

  • 6.5cm Depth

King £349
Or £9.38 monthly*
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Cool Foam Mattress Topper
  • 3 Layers

  • CertiPUR® foam

  • 6.5cm Depth

King £249
Or £20.75 monthly*
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Hybrid® Mattress Topper  Refurbished refurbished
  • 4 Layers

  • 2500 Springs

  • 6.5cm Depth


  • 100% tested, sanitised & certified by Simba

King £239
Or £19.91 monthly*
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Hybrid® Essential Mattress Topper  Refurbished refurbished
  • 4 Layers

  • 1500 Springs

  • 6.5cm Depth


  • 100% tested, sanitised & certified by Simba

King £189
Or £15.75 monthly*
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Is a King Size Mattress Topper Right For You?

The right king-size mattress topper can be a great choice if you’re looking to address certain issues that you’re facing with your current mattress. For example, if you or your partner find your current mattress too firm, a topper can add an extra layer of cushioning, which will enhance comfort.

If your mattress lacks support, a well-designed topper can create a more balanced surface to sleep on by distributing your weight more evenly. Mattress toppers can also be a practical option if your mattress is starting to look or feel worn, but you don’t want to replace it yet.

As you can see, there are many reasons or circumstances where a king-size mattress topper can be a worthwhile addition to your bed. Ultimately, whether you can benefit from one will depend on your specific needs and what aspect of your mattress you want to improve

Simbatex® vs Memory Foam

The large majority of general king-size mattress toppers are made using traditional memory foam. And while memory foam has its advantages, it also comes with several disadvantages that can seriously affect one’s quality of sleep. The biggest drawbacks to memory foam toppers include:

  • Limited airflow due to the foam’s dense structure
  • Heat retention, which can cause you to overheat at night
  • Slow response to movement
  • A “sinking” sensation that can feel quite restrictive

To address these drawbacks while capitalising on the benefits of memory foam, we engineered Simbatex® foam. It combines our award-winning sleep tech with the pressure-relieving properties of memory foam, resulting in a more supportive, comfortable, and breathable sleeping surface.

Why Buy a Simba King Size Mattress Topper?

To maintain the same standard of quality and performance that Simba’s award-winning mattresses are known for, we’ve used the exact same sleep tech and materials to create our king-size mattress toppers.

This means that you can enjoy many of the same benefits that our mattresses provide without the need to replace your current mattress. Other reasons why you should buy a Simba king-size mattress topper include:

  • You can trial your king-size bed topper for 200 nights
  • Your mattress topper will come with a 10-year guarantee
  • All our mattress toppers are designed here in the UK
  • We offer free next-day delivery to most postcodes across the UK
  • We offer a number of flexible finance options that you can take advantage of
  • Simba is the most 5-star rated mattress brand in the world*

  • What size is a king size mattress topper?

    Since king-size mattress toppers are designed to stay on top of a king-size mattress, they are the same size: 150cm (W) x 200cm (L). They can, however, vary in thickness, depending on the materials they’re made from. To offer the right balance of comfort and support, all Simba king-size mattress toppers measure 6.5cm.

  • What are the benefits of using a king size mattress topper?

    After a few years of use, generic mattresses can start to get tired and lose their support and responsiveness. Using a king size mattress topper is a smart solution to this common problem. Some of the benefits of using a king size mattress topper include:

    • Extends the lifespan of your mattress, so you don’t have to spend more money on buying a new mattress, while also reducing your environmental footprint
    • You’ll feel a noticeable improvement in both the level of comfort and support right away
    • Ideal for taller people and couples who find that their mattress alone doesn’t provide all the support they need
    • Mattress toppers are far easier to clean compared to king size mattresses
  • What are Simba king size mattress toppers made from?

    All Simba king size mattress toppers are made using advanced foam, springs, and durable support materials. When combined, the result is a comfortable, supportive, and breathable topper.

    To give you a more specific answer, some of the core components that we use for our toppers include Simbatex® foam, CertiPUR® foam, Aerocoil® springs, and a washable knitted cover that enhances airflow.

  • What is the difference between the Essential and Hybrid King Size mattress topper?

    The main differences between our Essential and Hybrid® king size mattress toppers come down to performance and feel. The Hybrid® topper features more springs (2,500 vs 1,500), better support, airflow, and responsiveness.

  • Can I use a king size mattress topper on any type of mattress?

    Mattress toppers are incredibly versatile and can help you address a wide range of comfort and support issues without replacing your mattress. So yes, you can use a king size mattress topper on any type of mattress - as long as the topper is the same size as the mattress.

  • How do I wash a king size mattress topper?

    That will depend on the materials that your king mattress topper is made of. To make sure that you wash your mattress topper correctly, always refer to the instructions provided by the manufacturer.

    If you have a Simba king size mattress topper, washing it is very easy. Simply unzip the white sleep surface, put it in the washing machine on a low temperature program, and once it’s ready, you can either air-dry it or put it in the tumble dryer on a low setting.

Happy Sleepers

We rest better when we know your honest opinion of us. Check out reviews from Simba sleepers below.

WIN BACK THE COST OF YOUR FIRST ORDER

Subscribe to our newsletter, order your first mattress online, and we’ll enter you into a monthly draw to win back the entire cost.

Please note the finance figures shown are for illustrative purposes only. Details of the actual figures will be available during the finance application process. Subject to affordability, age & status, minimum spend applies.