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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, DUVETS & MORE WORTH UP TO £836‡

Ends 27/04/2026, 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 mattress protector‡.
Hybrid Pro® & Escape mattress receives two† Hybrid™ pillows plus a Hybrid™ duvet and mattress protector‡.
Hybrid® Luxe, Hybrid® Ultra, & Apex mattress receives two† Hybrid™ pillows plus a Hybrid™ 3-in-1 duvet, and a mattress protector.‡

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

King Size Duvets

This is what luxury looks and feels like. With a sublime, down-like softness and a soothingly cooler feel, when you use your Simba king-size duvet, you’ll be sleeping on Cloud Nine all night, every night.

Each of our king size duvets is designed with our advanced sleep technology and premium materials, which can help you maintain the perfect sleep temperature throughout the night. So, browse through this page, choose the Simba king duvet that you like the most, and we’ll deliver it to you the very next day for free.

Hybrid™ Duvet
  • Down-like softness with ultra-fine Simba Renew Bio™ fibres

King £249
Or £20.75 monthly*
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Hybrid™ 3-in-1 Duvet
  • Two duvets with Simba Renew and our 'cool-touch' Stratos® technology

King £399
Or £10.54 monthly*
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Summer Hybrid™ Duvet
  • A wonderfully light, down-like duvet for warmer months, or hot sleepers.

King £219
Or £18.25 monthly*
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Hybrid™ Duvet  Refurbished
  • Down-like softness with ultra-fine Simba Renew Bio™ fibres

King £136.95
Sold out
Hybrid™ 3-in-1 Duvet  Refurbished
  • Two duvets with Simba Renew and our cooling Stratos® technology

King £219.45
Or £18.28 monthly*
Sold out
Summer Hybrid™ Duvet  Refurbished
  • A wonderfully light

  • down-like duvet for warmer months

  • or hot sleepers.

King £120.45
Sold out

Our Collection of King-Size Duvets

To meet the unique needs of every sleeper, our collection of king-size duvets includes a range of options designed for different seasons and comfort/temperature preferences. They include:

  • Hybrid™ Duvet: A 10.5 TOG duvet that’s perfect for year-round use
  • Hybrid™ 3-in-1 Duvet: A versatile option that includes a 3.5 TOG and a 7.5 TOG king size duvet, which can be used together or separately
  • Summer Hybrid™ Duvet: A lightweight 4.5 TOG duvet designed specifically for warmer nights and hot sleepers

Despite their differences in TOG rating and seasonal suitability, all our king-size duvets are designed with the same core focus on comfort, breathability, and temperature regulation.

Key Factors to Consider When Choosing a King Size Duvet

When choosing a king size duvet, there are several factors that you need to consider. They include:

TOG rating

The TOG rating of your king-size duvet measures how warm it will feel throughout the night. Lower TOG duvets are ideal for warm summer months and hot sleepers, while higher TOG duvets provide more insulation and are recommended during the colder winter months or for people who get cold easily.

Fill type

Next, you should take into consideration the type of fill used in the duvet. Synthetic fillings are typically lightweight, hypoallergenic, and easy to care for, while natural materials, such as wool, offer excellent breathability and temperature regulation.

Sleeping preferences

Finally, think about your personal sleeping habits. If you’re someone who easily overheats at night, a lighter and more breathable duvet will make a big difference in your quality of sleep. If you often feel cold, on the other hand, a higher TOG option with better insulation may be more suitable.

Why Choose a King Size Duvet From Simba?

The Simba king size quilt offers a super-soft and luxurious feel designed to keep you at a comfortable temperature throughout the night.  Even during hotter summer nights, our innovative Stratos® ‘cool-touch’ technology will help keep you feeling cool but cosy, while our Simba Renew® fibre fillings provide that silky down-like softness.

It might be big, but we stitch the super-soft filling evenly into square pockets so the comfort reaches every corner. That means no more lumps and bumps in the night and a soothing night’s sleep. Other reasons why you should choose a Simba king size duvet include:

  • They’re designed by our sleep experts here in the UK
  • We offer free next-day delivery on all king size duvets in the UK
  • We offer a 1-year guarantee on all Simba duvets
  • Our king duvets are lightweight and easy to wash
  • We offer a number of flexible finance options

  • What size is a king-size duvet?

    Simba king size duvets measure 220cm (L) x 225cm (W), which is the standard duvet size for a UK king size bed. In addition to our king-size duvets, at Simba, we also offer a variety of smaller and larger sizes, including single duvets, double duvets, and super king size duvets.

  • What tog duvet do I need?

    It depends on the season, the temperature in your bedroom, and how warm you tend to sleep. As a general rule of thumb, we’d recommend:

    • A 2.5 to 4.5 TOG king size duvet during the summer or for warmer bedrooms
    • A 7 to 10.5 TOG king size duvet for all seasons
    • A 10.5 TOG king size duvet (or higher) during the cold winter months
  • What is Simba’s Stratos cooling technology?

    Simba’s Stratos® cooling technology is a temperature-regulating system designed to keep you comfortable throughout the night. It uses phase-change material, also known as PCM, that actively responds to the temperature of your body.

    That way, if you get too warm at night, the Stratos® technology will absorb and store the excess heat, and as your body begins to cool down, it will release that stored heat back to you. In more simple terms, it helps you maintain a more consistent and comfortable body temperature throughout the night.

  • Can I machine wash a king-size duvet?

    Whether you can safely machine wash your king-size duvet will depend on the materials it’s made from and the instructions provided by the manufacturer. In most cases, you can wash your king-size duvet - even if you need to do it at a lower temperature.

    If you have a king duvet from Simba, you can wash it in your washing machine at 40C and tumble dry it on the lowest heat. You’ll find a label on your duvet with washing and care instructions. We recommend using a 9kg washing machine or larger to get your king size duvet really clean.

  • What size duvet cover do I need for a king-size duvet?

    To ensure the best fit, you’ll need a duvet cover that matches the exact dimensions of your king-size duvet. In the UK, a king size duvet measures 220cm (L) x 225cm (W), so you should choose a duvet cover with the same measurements. This will ensure that your duvet sits neatly inside the cover without bunching or moving excessively.

  • Are Simba duvets hypoallergenic?

    Yes, our duvets are hypoallergenic. All Simba duvets are made using high-quality, breathable, and washable materials. They are designed to help reduce the build-up of dust mites, bacteria, and allergens that could trigger allergic reactions or disrupt your sleep at night.

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.