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King Size Memory Foam Mattresses

King size memory foam mattresses solve almost all sleeping problems. Tired of feeling like you and your partner are sharing a sleeping bag? Then try out a king-size foam mattress, which matches plenty of space with comfort tailored around your body shape and sleeping habits. By coupling freedom of movement with a responsive foam design, choose a memory foam king size mattress, and you and your partner will never face a tug-of-war over space again!

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Deluxe Memory Foam Spring Rolled Mattress
(157)
Deluxe Memory Foam Spring Rolled Mattress
From£164.99 You Save: £40 Now From £124.99 You Save: £40
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Touch 3-Zone Memory Foam Orthopaedic Rolled Mattress
(104)
Touch 3-Zone Memory Foam Orthopaedic Rolled Mattress
From£204.99 You Save: £55 Now From £149.99 You Save: £55
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Balmoral 3500 Pocket Sprung Memory Foam Mattress
(109)
Balmoral 3500 Pocket Sprung Memory Foam Mattress
From£339.99 You Save: £100 Now From £239.99 You Save: £100
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Mersey Memory and Reflex Foam 1000 Pocket Sprung Mattress
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Mersey Memory and Reflex Foam 1000 Pocket Sprung Mattress
From£309.99 You Save: £90 Now From £219.99 You Save: £90
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Calder Spring Memory Foam Tufted Mattress
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Calder Spring Memory Foam Tufted Mattress
From£204.99 You Save: £55 Now From £149.99 You Save: £55
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Aire Memory and Reflex Foam 1000 Pocket Sprung Mattress
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Aire Memory and Reflex Foam 1000 Pocket Sprung Mattress
From£304.99 You Save: £90 Now From £214.99 You Save: £90
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Cashmere 3000 Pocket Sprung Memory Foam Mattress
(107)
Cashmere 3000 Pocket Sprung Memory Foam Mattress
From£339.99 You Save: £100 Now From £239.99 You Save: £100
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Touch 7-Zone Memory Foam Orthopaedic Rolled Mattress
(61)
Touch 7-Zone Memory Foam Orthopaedic Rolled Mattress
From£219.99 You Save: £60 Now From £159.99 You Save: £60
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Ocean Gel Pocket 2000 Foam Sprung Cool Ortho LayGel Mattress
(68)
Ocean Gel Pocket 2000 Foam Sprung Cool Ortho LayGel Mattress
From£264.99 You Save: £75 Now From £189.99 You Save: £75
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(79)
Bamboo Vitality 2000 Pocket Sprung Memory and Reflex Foam Mattress
From£394.99 You Save: £130 Now From £264.99 You Save: £130
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Maestro Spring Memory Foam Tufted Mattress
(134)
Maestro Spring Memory Foam Tufted Mattress
From£244.99 You Save: £70 Now From £174.99 You Save: £70
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(62)
Aloe Vera 1500 Pocket Sprung Memory and Reflex Foam Mattress
From£334.99 You Save: £100 Now From £234.99 You Save: £100
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Fusion Lite Memory and Recon Foam Orthopaedic Mattress
(14)
Fusion Lite Memory and Recon Foam Orthopaedic Mattress
From£214.99 You Save: £55 Now From £159.99 You Save: £55
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Imperial 3500 Pocket Sprung Mattress
(36)
Imperial 3500 Pocket Sprung Mattress
From£334.99 You Save: £95 Now From £239.99 You Save: £95
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Membound Memory Foam Spring Mattress
(112)
Membound Memory Foam Spring Mattress
From£204.99 You Save: £55 Now From £149.99 You Save: £55
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May Madness Sale
Pocket Memory Foam 2000 Individual Sprung Orthopaedic Mattress
(23)
Pocket Memory Foam 2000 Individual Sprung Orthopaedic Mattress
From£269.99 You Save: £85 Now From £184.99 You Save: £85
5 Year Guarantee
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Impressions 6000 Cool Blue Memory and Recon Foam Orthopaedic Mattress
(19)
Impressions 6000 Cool Blue Memory and Recon Foam Orthopaedic Mattress
From£294.99 You Save: £85 Now From £209.99 You Save: £85
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Fusion Plus Memory and Recon Foam Orthopaedic Mattress
(8)
Fusion Plus Memory and Recon Foam Orthopaedic Mattress
From£242.98 You Save: £108 Now From £134.99 You Save: £108
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Pocket Memory Foam 4000 Individual Sprung Orthopaedic Mattress
(10)
Pocket Memory Foam 4000 Individual Sprung Orthopaedic Mattress
From£354.99 You Save: £115 Now From £239.99 You Save: £115
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Fusion Extra Plus Memory and Recon Foam Orthopaedic Mattress
(9)
Fusion Extra Plus Memory and Recon Foam Orthopaedic Mattress
From£260.98 You Save: £116 Now From £144.99 You Save: £116
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Fusion Ultra Memory and Recon Foam Orthopaedic Mattress
(8)
Fusion Ultra Memory and Recon Foam Orthopaedic Mattress
From£368.98 You Save: £164 Now From £204.99 You Save: £164
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May Madness Sale
SleepSoul Balance 800 Pocket Spring and Memory Foam Mattress
(7)
SleepSoul Balance 800 Pocket Spring and Memory Foam Mattress
From£284.99 You Save: £90 Now From £194.99 You Save: £90
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May Madness Sale
Capsule Pillowtop 3000 Pocket Sprung and Memory Foam Mattress
New Arrival
Capsule Pillowtop 3000 Pocket Sprung and Memory Foam Mattress
From£1224.99 You Save: £430 Now From £794.99 You Save: £430
5 Year Guarantee
May Madness Sale
Fusion Super Memory and Recon Foam Orthopaedic Mattress
(9)
Fusion Super Memory and Recon Foam Orthopaedic Mattress
From£287.98 You Save: £128 Now From £159.99 You Save: £128
5 Year Guarantee

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Sleep like royalty

It’s difficult to imagine having any sleep issues on a king-sized mattress. With the material’s NASA-backed science behind it, you can guarantee that our king-size memory foam mattress will deliver sleep out of this world. As well as total comfort, the roomy dimensions of a king memory foam mattress give you plenty of space to stretch out. Browse below to find the best of the best here at Happy Beds.

What are the benefits of a king size memory foam mattress?

There are many benefits offered by a king size memory foam mattress, including:

  • Space - the second biggest mattress size in the UK, a king memory foam mattress offers oodles of space to stretch out.
  • Responsive memory foam - using innovative memory foam, the mattress will mould to your body throughout the night, using your body heat to help alleviate pressure on your body.
  • Prevents and soothes aches and pains - by reducing pressure points on your hips, spine and other joints, sleeping on a king memory foam mattress can help relieve existing aches and pains and prevent new ones from developing.
  • That sink-in feeling - the hug of a memory foam mattress is perfect at the end of a long day.

Read our mattress buying guide to help you find the right mattress for you. We'll talk you through the various fillings and ways to protect your mattress and keep it functioning for many years.

What size is a memory foam king size mattress?

A king-size mattress is 150cm x 200cm / 5ft x 6ft6, providing plenty of space to stretch out and get a great night's sleep. Whether you're a solo sleeper with a larger bedroom or a couple wanting more space, a king-size mattress is perfect.

Our king size mattresses are designed to fit a standard UK king bed frame. If you have a European king bed or a king size bed from IKEA, you’ll need a European king mattress.

Are any other memory foam mattresses available?

If you’re looking for the benefits of memory foam but aren’t ready to say goodbye to your traditional pocket sprung or open coil mattress, browse our range of hybrid mattresses. They combine a sprung base with a memory foam comfort layer, offering the best of both worlds.

If you’re looking for an alternative to memory foam, we stock a range of reflex foam mattresses offering similar cushioning and comfort properties.

Excellent
4.4 out of five star rating on Trustpilot
Rated 4.4 / 5 based on 13,469 reviews on
Showing our 4 & 5 star reviews View all reviews
I think the whole thing went perfectly…
I think the whole thing went perfectly…
I think the whole thing went perfectly from start t finis
Very good
Very good
Brilliant material, easy assembly, very nice service
Excellent customer service!!
Excellent customer service!!
Kyi from Happy Beds was excellent in sorting a problem out. Amazing customer service!. Thank you!! Mr Edwards
Fantastic mattress
Fantastic mattress
Fantastic mattress, very comfortable
Really good customer service from…
Really good customer service from…
Really good customer service from Chantal. She was very professional and dealt with my query very efficiently and quickly.
Great thanks
Great thanks
First class service throughout from Happy Beds. Thank you very much. Mattress delivered earlier than expected. Delivery guys very friendly and professional. They found the marina very easy. I went to them after phone call, to say they had arrived. Helped me load mattress on a trolley, waved bye. Mattress looks great and fits perfect. Highly recommend Happy Beds.
Great company even better customer service
Great company even better customer service
Quick delivery, good quality items. Customer service is great, we were speaking to a lady called Aimee as one of the parts for the bed was faulty. Dealt with it quickly and replacement sent a couple days after the initial enquiry. Thank you
Great prices and even better customer…
Great prices and even better customer…
Great prices and even better customer service. really impressed with this company. bunk beds are great and the problem I had was resolved by Caroline and Sophie with no hassle. Would definitely buy from them again