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King Size Memory Foam Mattresses

King-size memory foam mattresses solve almost all sleeping problems thanks to their large size and delightfully comfy memory foam construction! Coupling freedom of movement with a responsive foam design allows you to enjoy night after night of restful and restorative sleep, even if you have a partner who loves to hog the covers! Shop the range now and enjoy fast delivery with 0% interest finance options.

Items 1-24 of 28

Balmoral 3500 Pocket Sprung Memory Foam Mattress
4.8 star review
4.8
(116)
Balmoral 3500 Pocket Sprung Memory Foam Mattress
Medium
Pocket Spring
3500 Springs
£344.99 You Save: £100 Now From £244.99 You Save: £100
10% Off CODE: EXTRA10
Cashmere 3000 Pocket Sprung Memory Foam Mattress
4.9 star review
4.9
(116)
Cashmere 3000 Pocket Sprung Memory Foam Mattress
Medium
Pocket Spring
3000 Springs
£344.99 You Save: £100 Now From £244.99 You Save: £100
10% Off CODE: EXTRA10
1
4.9 star review
4.9
(64)
Aloe Vera 1500 Pocket Sprung Memory and Reflex Foam Mattress
Medium
Pocket Spring
1500 Springs
£344.99 You Save: £100 Now From £244.99 You Save: £100
10% Off CODE: EXTRA10
Mersey Memory and Reflex Foam 1000 Pocket Sprung Mattress
5 star review
5.0
(6)
Mersey Memory and Reflex Foam 1000 Pocket Sprung Mattress
Medium-Firm
Pocket Spring
1000 Springs
£314.99 You Save: £90 Now From £224.99 You Save: £90
Exclusive
Calder Spring Memory Foam Tufted Mattress
5 star review
5.0
(1)
Calder Spring Memory Foam Tufted Mattress
Medium
Memory Foam
Open Coil Spring
£209.99 You Save: £60 Now From £149.99 You Save: £60
Exclusive
Aire Memory and Reflex Foam 1000 Pocket Sprung Mattress
5 star review
5.0
(1)
Aire Memory and Reflex Foam 1000 Pocket Sprung Mattress
Medium
Pocket Spring
1000 Springs
£314.99 You Save: £90 Now From £224.99 You Save: £90
Exclusive
Deluxe Memory Foam Spring Rolled Mattress
4.7 star review
4.7
(160)
Deluxe Memory Foam Spring Rolled Mattress
Medium
Memory Foam
Open Coil Spring
£184.99 You Save: £45 Now From £139.99 You Save: £45
10% Off CODE: EXTRA10
Touch 3-Zone Memory Foam Orthopaedic Rolled Mattress
4.9 star review
4.9
(109)
Touch 3-Zone Memory Foam Orthopaedic Rolled Mattress
Medium-Firm
Memory Foam
Orthopaedic
£214.99 You Save: £55 Now From £159.99 You Save: £55
10% Off CODE: EXTRA10
Imperial 3500 Pocket Sprung Mattress
4.9 star review
4.9
(34)
Imperial 3500 Pocket Sprung Mattress
Medium
Pocket Spring
3500 Springs
£339.99 You Save: £95 Now From £244.99 You Save: £95
10% Off CODE: EXTRA10
Maestro Spring Memory Foam Tufted Mattress
4.8 star review
4.8
(140)
Maestro Spring Memory Foam Tufted Mattress
Soft-Medium
Memory Foam
Open Coil Spring
£249.99 You Save: £70 Now From £179.99 You Save: £70
10% Off CODE: EXTRA10
1
4.8 star review
4.8
(81)
Bamboo Vitality 2000 Pocket Sprung Memory and Reflex Foam Mattress
Medium-Firm
Pocket Spring
2000 Springs
£404.99 You Save: £130 Now From £274.99 You Save: £130
10% Off CODE: EXTRA10
Ocean Gel Pocket 2000 Foam Sprung Cool Ortho LayGel Mattress
4.9 star review
4.9
(69)
Ocean Gel Pocket 2000 Foam Sprung Cool Ortho LayGel Mattress
Medium-Firm
Pocket Spring
2000 Springs
£279.99 You Save: £80 Now From £199.99 You Save: £80
10% Off CODE: EXTRA10
Touch 7-Zone Memory Foam Orthopaedic Rolled Mattress
4.8 star review
4.8
(68)
Touch 7-Zone Memory Foam Orthopaedic Rolled Mattress
Medium-Firm
Memory Foam
Rolled
£234.99 You Save: £65 Now From £169.99 You Save: £65
10% Off CODE: EXTRA10
SleepSoul Balance 800 Pocket Spring and Memory Foam Mattress
4.8 star review
4.8
(20)
SleepSoul Balance 800 Pocket Spring and Memory Foam Mattress
Medium
Pocket Spring
800 Springs
£289.99 You Save: £90 Now From £199.99 You Save: £90
5 Year Guarantee
Membound Memory Foam Spring Mattress
4.8 star review
4.8
(114)
Membound Memory Foam Spring Mattress
Soft
Memory Foam
Open Coil Spring
£209.99 You Save: £60 Now From £149.99 You Save: £60
10% Off CODE: EXTRA10
SleepSoul Celest 3000 Pocket Spring Mattress
New Arrival
SleepSoul Celest 3000 Pocket Spring Mattress
Firm
Pocket Spring
3000 Springs
£989.99 You Save: £350 Now From £639.99 You Save: £350
5 Year Guarantee
Fusion Lite Memory and Recon Foam Orthopaedic Mattress
4.7 star review
4.7
(15)
Fusion Lite Memory and Recon Foam Orthopaedic Mattress
Medium
Memory Foam
Orthopaedic
£229.99 You Save: £60 Now From £169.99 You Save: £60
10% Off CODE: EXTRA10
Impressions 6000 Cool Blue Memory and Recon Foam Orthopaedic Mattress
4.9 star review
4.9
(20)
Impressions 6000 Cool Blue Memory and Recon Foam Orthopaedic Mattress
Medium-Firm
Memory Foam
Rolled
£314.99 You Save: £90 Now From £224.99 You Save: £90
10% Off CODE: EXTRA10
Capsule Pillowtop 3000 Pocket Sprung and Memory Foam Mattress
5 star review
5.0
(1)
Capsule Pillowtop 3000 Pocket Sprung and Memory Foam Mattress
Medium
Pocket Spring
3000 Springs
£1279.99 You Save: £450 Now From £829.99 You Save: £450
5 Year Guarantee
SleepSoul Orion Cool Gel Foam Pocket Spring Mattress
5 star review
5.0
(1)
SleepSoul Orion Cool Gel Foam Pocket Spring Mattress
Medium-Firm
Pocket Spring
Rolled
£484.99 You Save: £80 Now From £404.99 You Save: £80
5 Year Guarantee
Capsule Boxtop 2000 Pocket Sprung and Memory Foam Mattress
New Arrival
Capsule Boxtop 2000 Pocket Sprung and Memory Foam Mattress
Medium-Firm
Pocket Spring
2000 Springs
£1109.99 You Save: £390 Now From £719.99 You Save: £390
5 Year Guarantee
SleepSoul Comfort 800 Pocket Spring Mattress
4.7 star review
4.7
(3)
SleepSoul Comfort 800 Pocket Spring Mattress
Medium
Pocket Spring
800 Springs
£264.99 You Save: £80 Now From £184.99 You Save: £80
5 Year Guarantee
SleepSoul Celest 2000 Pocket Spring Mattress
New Arrival
SleepSoul Celest 2000 Pocket Spring Mattress
Medium
Pocket Spring
2000 Springs
£919.99 You Save: £325 Now From £594.99 You Save: £325
5 Year Guarantee
Capsule Memory Foam Pocket Sprung Mattress
5 star review
5.0
(1)
Capsule Memory Foam Pocket Sprung Mattress
Medium-Firm
Memory Foam
Pocket Spring
£564.99 You Save: £185 Now From £379.99 You Save: £185
5 Year Guarantee

Items 1-24 of 28

King-size memory foam mattresses FAQs

Are you unsure about the benefits of memory foam or whether a king-size mattress will suit your needs? We've found some of the most frequently asked questions about king-size memory foam mattresses and answered them to give you all the information you need!

What size is a king memory foam mattress?

A memory foam king-size mattress is 5' x 6'6" or 150 x 200cm, perfectly sized to fit a king-size bed! As its large size suggests, a 5ft memory foam mattress is a must-have for anyone who loves to sleep with plenty of space. They're great for couples to sleep without bumping into each other or for solo sleepers to have the most luxurious sleep.

Not sure if this size will suit your needs? Our mattress size guide explains the sizes available to help you make the right choice for your space and sleep needs.

What benefits does a king-size memory foam mattress offer?

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

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

Want to find out more about this innovative mattress type? Our memory foam mattress guide answers some of the most frequently asked questions, and our general mattress buying guide explores other types if you want to compare!

What firmness levels are king memory foam mattresses available in?

Our king-size memory mattresses are available in all our most popular firmness levels, including:

  • Soft
  • Soft-medium
  • Medium
  • Medium-firm
  • Firm

Something you might see with memory foam is that it might be described as 'low density' or 'high density'. This relates directly to the firmness levels, with a higher density mattress featuring more foam per cubic foot, which makes it heavier and more supportive. Lower densities, such as soft memory foam mattresses, will return to their original shape faster!

So, whether you want the extra support a firm king-size memory foam mattress provides or would rather splurge on the comfort of a softer rating, our range has something for every sleeper.

Why should I buy a memory foam king-size mattress from Happy Beds?

Whether you're looking for something new to try or want to upgrade your old mattress, buying from Happy Beds means you get to enjoy some of our fantastic benefits, such as:

  • Quick delivery - there's no need to get poor-quality sleep anymore, as we have mattresses in stock and ready to be delivered with our standard and premium delivery services.
  • Manufacturer's guarantee – give yourself peace of mind with the knowledge that your new king-size memory foam mattress comes with a 5-year guarantee as standard!
  • Simple payment options – whether you want to pay for your purchase up front or spread the cost with a 0% interest finance option from Klarna or PayPal, we've got plenty of ways to pay.