King Size Mattresses

What size is a king size mattress?

A king size mattress is 150 cm wide and 200 cm long. It is bigger than a double mattress and slightly smaller than a super king. You can find all the mattress sizes in our handy mattress size guide.
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SILENTNIGHT SUMMER LOVIN' - Save Up To 20% Off Mattresses
  1. Silentnight Eco Comfort Breathe Pocket 1200 Mattress Silentnight Eco Comfort Breathe Pocket 1200 Mattress
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    Was from £659.00 Now from £527.20
    Medium Mirapocket Eco Comfort
  2. Silentnight Geltex Ultra 3000 Mattress - Medium Silentnight Geltex Ultra 3000 Mattress - Medium
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    Was from £1,019.00 Now from £815.20
    Medium Mirapocket Geltex
  3. Silentnight Geltex Ultra 3000 Mattress - Medium Soft Silentnight Geltex Ultra 3000 Mattress - Medium Soft
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    Was from £1,019.00 Now from £815.20
    Medium/Soft Mirapocket Geltex
  4. Silentnight Geltex Ultra 3000 Mattress - Medium Firm Silentnight Geltex Ultra 3000 Mattress - Medium Firm
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    Was from £1,019.00 Now from £815.20
    Medium/Firm Mirapocket Geltex
  5. Silentnight Essentials Pocket 600 Double Sided Mattress Silentnight Essentials Pocket 600 Double Sided Mattress
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    Was from £249.00 Now from £224.10
    Medium
  6. Silentnight Natural Pocket 1400 Mattress Silentnight Natural Pocket 1400 Mattress
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    Was from £789.00 Now from £631.20
    Firm Mirapocket Natural Fillings
  7. Silentnight Natural Pocket 2000 Mattress Silentnight Natural Pocket 2000 Mattress
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    Was from £839.00 Now from £671.20
    Medium Mirapocket Natural Fillings
  8. Silentnight Natural Pocket 1000 Mattress Silentnight Natural Pocket 1000 Mattress
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    Was from £739.00 Now from £591.20
    Medium/Firm Mirapocket Natural Fillings
  9. Studio by Silentnight Medium Mattress Studio by Silentnight Medium Mattress
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    Was from £699.00 Now from £549.00
    Medium Foam Geltex
  10. Studio by Silentnight Softer Mattress Studio by Silentnight Softer Mattress
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    Was from £699.00 Now from £549.00
    Medium/Soft Foam Geltex
  11. Studio by Silentnight Firmer Mattress Studio by Silentnight Firmer Mattress
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    Was from £699.00 Now from £549.00
    Medium/Firm Foam Geltex
  12. Silentnight Pocket Geltex 1000 Mattress Silentnight Pocket Geltex 1000 Mattress
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    Was from £739.00 Now from £591.20
    Medium Mirapocket Geltex
  13. Silentnight Pocket Geltex 2000 Mattress Silentnight Pocket Geltex 2000 Mattress
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    Was from £919.00 Now from £735.20
    Medium/Soft Mirapocket Geltex
  14. Silentnight Miracoil Geltex Mattress Silentnight Miracoil Geltex Mattress
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    Was from £599.00 Now from £479.20
    Medium/Firm Miracoil Geltex
  15. Silentnight Mirapocket 1000 Geltex Pillow Top Mattress Silentnight Mirapocket 1000 Geltex Pillow Top Mattress
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    £809.00
    Medium Mirapocket Geltex
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Enjoy Complete Comfort with a Silentnight King Size Mattress

We want you to revel in the countless comfort benefits of sleeping in a Silentnight king size mattress. At Silentnight we understand the importance of undisturbed sleep; with countless advantages, such as improved concentration, wellbeing and health. With this in mind, our ambition is to provide perfect sleep solutions for the whole family.

Not looking for a King size mattress, we have other sizes available in single, small double, double and super king.

Comfort starts with the size of your Silentnight king size mattress; providing you with as much sleep space as possible, you’ll have the freedom to move throughout the night and indulge in complete sleep satisfaction.

Find a Silentnight King Size Mattress That Fits Your Mould

As the UK’s leading sleep experts, we recognise that comfort factors differ for each sleeper. With this in mind, our king size mattress range is designed with a variety of comfort fillings; making it easier to find the perfect Silentnight king size mattress for your needs.

Designed with our exclusive Silentnight Miracoil and Mirapocket springs systems, our Silentnight king size mattresses work to distribute weight evenly across the bed; minimising partner disturbances. Functioning in absolute harmony with your body, the unique spring systems successfully respond to all body shapes and sizes, providing targeted support and pressure relief.

A Silentnight king size mattress is all you need for a perfect night’s sleep, however, we understand that picking up and installing a King Size mattress may be a daunting task - but there’s no need to worry, as we’ll do all the hard work for you. We offer FREE UK delivery, so once you’ve chosen your dream mattress there’s no stress or waiting around, we’ll even remove your previous mattress for you - find your answer to total comfort in our Silentnight king size mattress range.

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Silentnight Group Limited. Registered in England 7525259 Vat Registration No GB 108 2580 29 Registered Office: Silentnight Group Limited, Long Ing Business Park, Long Ing Lane, Barnoldswick, Lancashire BB18 6BJ

Free UK Delivery

Our standard 2 Man Delivery Service (Mattresses & Divans)

  • Free UK delivery* to your room of choice throughout England, Scotland and Wales.
  • We provide a free professional two man delivery service that will deliver your purchases to your room of choice.
  • This service includes the set up of your bed or mattress in your chosen room, plus the removal and takeaway of the packaging.
  • We deliver most items Monday to Friday, 9am - 6pm.
  • On average products are delivered within 7 - 14 days.
  • *Some restrictions apply, please visit our delivery information for more detail.

Next Day Delivery Service (Mattresses/Bedframes)

  • Free Next Day Delivery, via a courier, to the door only.
  • A card will be left, with a contact number to call for re-delivery, if there is no one in.
  • Delivery will be between 8am - 7pm - Monday to Friday for Mattress-Now products
  • If ordered with another item, the Next Day Delivery will be delivered first, usual delivery terms apply for additional items (this may incur 2 deliveries)

60 night comfort trial

We're so confident that our beds and mattresses will provide you with a great night's sleep that we offer the security of the very best in terms of comfort guarantee.

  • At Silentnight we want to be sure that you are satisfied with the comfort of your new bed or mattress which is why we offer a total peace of mind 60 night comfort guarantee. If for any reason you are not totally satisfied we will exchange your purchased bed or mattress for an alternative Silentnight bed or mattress of your choice.
  • We do however ask that you try your new bed for at least four weeks for your body to adjust to your new bed or mattress.
  • For full terms and conditions, please click here for further details.

Total Quality Assurance

Before it gets to you your bed has been through a lot

  • All our mattresses, upholstered bases and headboards are made in the UK
  • All of our product meet European standards and exceed British standards
  • All our Upholstered beds and mattresses ordered through Shop.Silentnight are made to order
  • This means they are not stored for prolonged periods of time and are shipped to you direct from our factory.

Testing

  • Accredited onsite laboratory to bring the best products to you
  • Every Silentnight mattress type is tested to ensure it exceeds all British standards
  • Silentnight products are fully certified by the Forest Stewardship Council®(FSC®) FSC-C104461
  • We are full members of the Furniture Industry Sustainability Program.
Superbrands The Sleep Council nbf approved